1. Strategic Decisions to 1990: A Planning Document;Agriculture Canada,1987
2. Growing Together: A Vision for Canada's Agri-food Industry;Agriculture Canada,1989
3. Agroecology: A new research and development paradigm for world agriculture;Altieri;Agric. Ecosystems Environ,1989
4. The social ecology of soil erosion in a Columbia farming system;Ashby;Rural Sociol.,1985
5. The Evolution of Cooperation;Axelrod,1984