Robert J. Holmer, Gina S. Itchon, 2008. Reuse of Ecological Sanitation Products in Urban Agriculture: Experiences from the Philippines. Urban Agriculture Magazine, 20, 44-46, RUAF, Leusden, Netherlands.

PUVeP, 2008. Philippine allotment garden manual with an introduction to ecological sanitation. Periurban Vegetable Project (PUVeP), Xavier University College of Agriculture, Cagayan de Oro City, Philippines. 104 p.

Gina S. Itchon, Robert J. Holmer, Ma. Luisa B. Tan, 2008. An Observational Study to Determine the Length of Time Necessary to Eradicate Parasitic Ova and Pathogenic Bacteria in Human Excreta Kept in the Storage Vaults of Urine-Diverting Dehydration Toilets in Cagayan de Oro City 2007 -2008: A Preliminary Report. Faculty Working Series No. 11, March 2008, Kinaadman Research Center, Xavier University, Cagayan de Oro City Philippines, 6p.

Axel W. Drescher & Robert J. Holmer (eds), 2007. Beyond Project Borderlines – the Asia Urbs Project “GIS based Urban Environmental Planning & Food Security Project”.  APT Report No. 16, December 2007, Applied Geography of the Tropics and Subtropics (APT), Institute of Physical Geography, University of Freiburg, Germany.101p (ISSN 0949-6645).

Glenda Y. Sol & Robert J. Holmer, 2007. Establishment of Urine Diverting Dehydration Toilets in the Allotment Gardens of Cagayan de Oro. In Axel W. Drescher & Robert J. Holmer (eds). Beyond Project Borderlines – the Asia Urbs Project “GIS based Urban Environmental Planning & Food Security Project”.  APT Report No. 16, December 2007, Applied Geography of the Tropics and Subtropics (APT, Institute of Physical Geography, University of Freiburg, Germany. 44-51 (ISSN 0949-6645).

Yvette B. Guanzon, van Oudenhouve J.P, Orban, F., Holmer, R.J., 2007. Identification of Potential Allotment Garden Sites in Cagayan de Oro using Participatory GIS Approaches. In Axel W. Drescher & Robert J. Holmer (eds). Beyond Project Borderlines – the Asia Urbs Project “GIS based Urban Environmental Planning & Food Security Project”.  APT Report No. 16, December 2007, Applied Geography of the Tropics and Subtropics (APT, Institute of Physical Geography, University of Freiburg, Germany. 64-78 (ISSN 0949-6645).

Michael Z. Nuesca, Stephen O. Lee, Lasse Trappe, Robert J. Holmer, 2007. Effect of vermicomposting on the presence of helminth ova (Necator americanus, Trichuris trichiura, Ascaris lumbricoides) in human faeces. In: Proceedings of the “International Conference on Sustainable Sanitation: Eco-Cities and Villages", August 26-31, 2007, Dongsheng, China.

Analiza U. Miso, 2007. Assessment of the Socio-economic Impact and Environmental Implication of Allotment Gardens in Cagayan de Oro City, Philippines. M.Sc. Thesis, Department of Agricultural Economics and Social Sciences in Tropics and Subtropics, University of Hohenheim, Germany. 147 p.

Bella Monse, Robert J. Holmer, 2007. Promotion de la santé dans les écoles primaires aux Philippines. L’Information Dentaire 89 (10): 29

Robert J. Holmer, Bella Monse, 2006. School health programmes pay dividends. Appropriate Technology, 33 (4): 56-59.

Robert J. Holmer, Analiza U. Miso, 2006. A City-Wide Ecosan Concept for Cagayan de Oro, Philippines. Proceedings of the GTZ/BMZ/DWA Conference "New Sanitation Concepts - International Project Experiences and Dissemination Strategies, Eschborn , Germany , October 25-26, 2006.

Robert J. Holmer & Axel W. Drescher, 2006. Empowering Urban Poor Communities through Integrated Vegetable Production in Allotment Gardens: The Case of Cagayan de Oro City, Philippines. Proceedings of the FFTC-PCARRD International Workshop on Urban/Peri-Urban Agriculture in the Asian and Pacific Region, Tagaytay City, Philippines, May 22-26, 2006, p. 20-40.

Axel W. Drescher, Holmer, R.J., and D.L. Iaquinta, 2006. Urban homegardens and allotment gardens for sustainable livelihoods: Management strategies and institutional environments. In:  Kumar, B.M., Nair, P.K.R. (Eds.) Tropical Homegardens: A time-tested example of Sustainable Agroforestry. Advances in Agroforestry, Vol. 3, Springer, New York: 317-338

Robert J. Holmer & Axel W. Drescher, 2005. Allotment gardens of Cagayan de Oro: Their contribution to food security and urban environmental management. In: Urban and Peri-Urban Development: A Comparison of Conflict Structures and Solutions. Southeast Asian – German Summer School 2005, October 16-29, 2005, Cologne, Germany: 149-155. (ISBN 3-00-018291-8)

Robert J. Holmer & Axel W. Drescher, 2005. Building Food Secure Neighbourhoods: the Role of Allotment Gardens. Urban Agriculture Magazine, 15, 19-20, RUAF, Leusden, Netherlands.

Jana Gerold, Drescher, A.W., Holmer, R. J., 2005. Kleingärten zur Armutsminderung - Schrebergärten in Cagayan de Oro. Südostasien 21 (4): 76 - 77.

Robert J. Holmer, Clavejo, M.T., Dongus, S., Drescher, A., 2003. Allotment Gardens for Philippine Cities. Urban Agriculture Magazine, 11, 29-31,  RUAF, Leusden, Netherlands.

Yvette B. Guanzon, Robert J. Holmer, 2003. Basic cultural management practices for vegetable production in urban areas of the Philippines. Urban Agriculture Magazine, 10, 14-15,  RUAF, Leusden, Netherlands.

Wilfried H. Schnitzler, R.J. Holmer, 2002. Prospective issues and challenges of urban fringe agriculture. Report of the APO Seminar on Urban Fringe Agriculture held in Tokyo from 17 to 24 May 2000. Asian Productivity Organization, 2002. ISBN: 92-833-2329-7, S. 53-63.

Robert J. Holmer, 2001. Appropriate methods for microenterprise development in urban agriculture. Urban Agriculture Magazine, 5:51-53. RUAF, Leusden, Netherlands

Amelia Luz P. Agbayani, Holmer, R.J., Potutan, G.E., Schnitzler, W.H., 2001. Quality and quantity requirements for vegetables by private households, vendors and institutional users in a Philippine urban setting. Urban Agriculture Magazine, 5, 56-57. RUAF, Leusden, Netherlands

Bounkong Souvimonh, Phanmalivong, K., Schnitzler, W.H., Holmer, R.J., Potutan, G.E., 2001. Marketing of peri-urban vegetable products in Vientiane Municipality, Lao Journal of Agriculture and Forestry, 3,11-17.

Carmen Thönnissen, Midmore, D. J., Ladha, J. K., Holmer, R. J., Schmidhalter, U., 2000. Tomato crop response to short-duration legume green manures in tropical vegetable systems. Agronomy Journal 92:245-253.

Wilfried H. Schnitzler & Robert J. Holmer, 2000. Urban vegetable production in Southeast Asia . Entwicklung + Ländlicher Raum 4:26-29 (ISSN 0343-6462)

Gerald E. Potutan, Schnitzler, W.H., Arnado, J.M., Janubas, L.G., Holmer, R.J., 2000. Urban agriculture in Cagayan de Oro: a favourable response of city government and NGOs. In: Bakker, M., Dubbeling, M., Sabel-Koschella, U., Zeeuw, H. (eds). Growing Cities Growing Food; Urban Agriculture on the Policy Agenda. DSE, Feldafing, Germany. ISBN 3-934068-25-10, pp. 413-428.

Trüggelmann, L., Holmer, R.J., Schnitzler, W.H., 2000. The use of municipal waste composts in urban and peri-urban vegetable production systems: potentials & constraints. ATSAF Tagungsband, Deutscher Tropentag Berlin, October 14-15, 1999. Humboldt Universität Berlin, Landwirtschaftlich-Gärtnerische Fakultät, pp. 56-57.

Robert J. Holmer, Potutan, G. E., Schnitzler, W. H., 1999. Urban horticulture in the Philippines: Its impact on food security, health, gender and urban environment. Proceedings of the Sub-Regional Workshop on Constraints and Opportunities for the Development of Urban and Peri-Urban Horticulture in South-East Asia, October 16-19, 1999, Kunming, Yunnan, China. Ministry of Agriculture, People's Republic of China, Food and Agriculture Organization of the United Nations, Rome, Italy, pp 39-48.

Wilfried H. Schnitzler & Robert J. Holmer, 1999. Strategies for urban horticulture in developing countries. Acta Horticulturae No. 495:331-335.

Wilfried H. Schnitzler & Robert J. Holmer, 1999. Project summary of "Urban and Peri-Urban Small and Medium-Sized Enterprise Development for Sustainable Vegetable Production and Marketing Systems (PUVeP)" Project. Chronica Horticulturae 39 (3):8-9.

Wilfried H. Schnitzler, Kham Sanatem, Potutan, G. E., Janubas, L. G., Holmer, R. J. 1999. City harvests in Vientiane City. Gate - Technology and Development. 2:23.

Wilfried H. Schnitzler, Pham Van Bien, Ngo Quang Vinh, Potutan, G. E., Janubas, L. G., Holmer, R. J. 1999. Urban agriculture in Ho Chi Minh City, Vietnam. Gate - Technology and Development. 2:26.

Wilfried H. Schnitzler, Potutan, G. E., Arnado, J. M., Janubas, L. G., Holmer, R. J. 1999. Urban agriculture in Cagayan de Oro, Philippines . Gate - Technology and Development. 2:46-47.

Wilfried H. Schnitzler & Robert J. Holmer, 1999. Perspectives of urban and periurban horticulture. Mediterranean Perspectives and Proposals. Journal of Economics, Agriculture and Environment 1:34-36.

Wilfried H. Schnitzler, Holmer R. J., Heinrich V. B., 1998. Urban agriculture? An essential element in feeding the world's cities. Development & Cooperation (D+C) 5:26-27.

Janet M. Arnado, Holmer, R. J., Schnitzler, W. H., 1998. Socio-economic interactions of periurban vegetable production, marketing and consumption in the Philippines. 42. Jahrestagung vom 10. - 12. September 1998 in Freising-Weihenstephan, Band 11: 149-150.

Wilfried H. Schnitzler & Robert J. Holmer, 1997. Preliminary results of a European Union financed project on urban vegetable production in South-East Asia. Kasetsart J. (Nat. Sci.) 32 (5):21-26 (ISSN 0075-5192).

Robert J. Holmer, Gabutin, L.B., Schnitzler, W.H., 1997. Organic fertilizer production from city waste: A model approach in a Southeast Asian urban environment. Kasetsart J. (Nat. Sci.) 32 (5):50-53 (ISSN 0075-5192).

Juan C. Acosta, Domingo G.C., Holmer R.J., Schnitzler, W.H., 1997. Genetic resources for urban tomato cultivation in the tropics. Kasetsart J. (Nat. Sci.) 32 (5):54-55 (ISSN 0075-5192).

Robert J. Holmer & Wilfried H. Schnitzler, 1997. Drip irrigation for small-scale tomato production in the tropics. Kasetsart J. (Nat. Sci.) 32 (5):56-60 (ISSN 0075-5192).

Gerald E. Potutan, Janubas L. G., Arnado J. M., Holmer, R. J., Schnitzler, W. H., 1997. Periurban vegetable production, consumption and marketing in Cagayan de Oro, Philippines. Kasetsart J. (Nat. Sci.) 32 (5):61-66 (ISSN 0075-5192).

Robert J. Holmer & Wilfried H. Schnitzler, 1997. Urban and periurban small and medium-sized enterprise development for sustainable vegetable production and marketing systems. 11./12. Dezember 1997. Tagungsband Tropentag Universität Hohenheim, - Technischer Fortschritt im Spannungsfeld von Ernährungssicherung un Resourcenschutz. p. 343-346