Food and feed crops of the United StatesMagness, J.R., G.M. Markle, C.C. Compton. 1971.
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
CoffeeDescriptors for Coffee (Coffea spp. and Psilanthus spp.)Link to the publication on the International Plant Genetic Resources Institute web site
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