Castro, Alfonso H. Peter. (1991) 1991. “Indigenous Kikuyu Agroforestry: A Case Study of Kirinyaga, Kenya”. Human Ecology 19 (1): 1-18. doi:10.2307/4602996.
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Castro, Alfonso H. Peter. (1989) 1989. “Njukiine Forest: Transformation of a Common-Property Resource”. Forest & Conservation History 35 (4): 160-68. doi:10.2307/3983495.