Deboer, W. R. 1975. The archaeological evidence for manioc cultivation: A cautionary note. American Antiquity 40(4):419–433.
Dole, Gertrude E. 1956. Techniques of preparing manioc flour as a key to culture history in tropical America. Men and cultures, ed. by A.F.C. Wallace. Philadelphia: Univ. of Pennsylvania Press.
Lozano, J. C. 1977a. African cassava mosaic: A threat to the crop in America and Asia. Cassava Newsletter 1:4–5.
Nassar, N. M. A. 1976. Conservation of genetic resources of cassava (mandioca), Manihot esculenta, Crantz: Determination of wild species localities with emphasis on cassava probable origin. Ciência e Cultura 28(12):1486–1492.
Renvoise, B. S. 1973. The area of origin of Manihot esculenta as a crop plant: A review of the evidence. Economic Botany 26:352–360.
Rogers, D. J. 1972. Further considerations on the origin of Manihot esculenta, Crantz. Trop. Root and Tuber Crop Newsletter 6:4–9.