Warren, D. Michael, L. Jan  Slikkerveer, and David  Brokensha, eds.. 1995. The Cultural Dimension Of Development: Indigenous Knowledge Systems. It Studies In Indigenous Knowledge And Development Series. London: Intermediate Technology Publications Ltd [Practical Action Publishing]. https://www.worldcat.org/title/257046951.

Warren, D. Michael. 1991. ?Indigenous Knowledge And Development (Revised Version)?. In . Washington, DC.

Niamir, Maryam. 1990. Community Forestry: Herders' Decision-Making In Natural Resources Management In Arid And Semi-Arid Africa. Community Forestry Note No. 4. Rome: Food and Agriculture Organization of the United Nations. http://www.fao.org/3/t6260e/t6260e00.htm.

International Institute of Rural Reconstruction (IIRR), Department of Environment and Natural Resources (DENR), and Ford Foundation (FF). 1990. ?Plant-Based Livestock Medication?. In Agroforestry Technology Information Kit (Denr/Iirr/Ff).