| agriculture.de | Sustainable Animal Production: Workshops, Discussion, Resources |
| chello.nl | Sustainable Nutrient Management in Agriculture |
| berkeley.edu | Agroecology |
| wisc.edu | Center for Integrated Agricultural Systems |
| buttecounty.net | Biologically Integrated Farming Systems in Rice |
| protectedharvest.org | Protected Harvest |
| ucdavis.edu | Long-Term Research on Agricultural Systems |
| uog.edu | University of Guam: PEOPLE |
| tilthproducers.org | Tilth Producers |
| stedula.be | Sustainable Agriculture, Policy Research Centre for - Steunpunt Duurzame Landbou |
United States , Pennsylvania , Eldred