1991
“Nfu's Annual Conference 1991”. Proceedings Of Nfu's Annual Conference 1991: Natural Resource Use And Changing Society, Interdisciplinary Approaches To Development, Agricultural University Of Norway, Aas, 23-24 May 1991.. Aas [Ås], Norway; Oslo, Norway: Norwegian Centre for International Agricultural Development, Agricultural University of Norway; Norwegian Association for Development Research. http://www.worldcat.org/oclc/29625062.
. 1991. 1990
“Land Use, Soil Loss, And Sustainable Agriculture In Rwanda”. Human Ecology 18 (2): 147-161. doi:10.1007/BF00889179.
. 1990. 1989
The Gene Hunters: Biotechnology And The Scramble For Seeds. African Centre For Technology Studies Research Series No. 1. Princeton, NJ: Princeton University Press. http://www.worldcat.org/oclc/19269376.
. 1989.