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“Traditional Tree Crop Based Agroforestry In Coffee Producing Areas Of Harerge, Eastern Ethiopia”. Agroforestry Systems 16 (3): 257-267. doi:10.1007/BF00119322. https://doi.org/10.1007/BF00119322.
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“Farmers' Production Of Timber Trees In The Cacao-Coffee Region Of Coastal Ecuador”. Agroforestry Systems 9 (2): 155-170. doi:10.1007/BF00168260. https://doi.org/10.1007/BF00168260.
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