Rwanda

Den Biggelaar, Christoffel Johannes Petrus Antonius Maria. (1994) 1994. “Farmer Knowledge and Experimentation With Trees and Tree Cultivation in Agroforestry Systems in Rwanda”. East Lansing, MI: Michigan State University, Department of Forestry. http://www.worldcat.org/oclc/33975106.

Den Biggelaar, Christoffel Johannes Petrus Antonius Maria. (1994) 1994. “Differentiating the Nature of Agroforestry Systems and Agroforestry Knowledge Among Farmers in Southern Rwanda: Participatory and Formal Approaches As Complementary Methods”. Culture & Agriculture 15 (50): 5-11. doi:10.1525/cuag.1994.15.50.5.

Clay, Daniel C., and Laurence A. Lewis. (1990) 1990. “Land Use, Soil Loss, and Sustainable Agriculture in Rwanda”. Human Ecology 18 (2): 147-61. doi:10.1007/BF00889179.