Godfrey, S. W. (1976). Cassava (Manihot Esculenta) fertilizer and nutritional studies in Sierra Leone, West Africa. s.n.
Lua i Stíl Chicago (17ú heag.)Godfrey, Sam-Aggrey W. Cassava (Manihot Esculenta) Fertilizer and Nutritional Studies in Sierra Leone, West Africa. S.l: s.n, 1976.
Lua MLA (9ú heag.)Godfrey, Sam-Aggrey W. Cassava (Manihot Esculenta) Fertilizer and Nutritional Studies in Sierra Leone, West Africa. s.n, 1976.
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