Githens, T. S. 1. (1949). Drug plants of Africa. University of Pennsylvania Press.
Lua i Stíl Chicago (17ú heag.)Githens, Thomas S 1878. Drug Plants of Africa. Philadelphia: University of Pennsylvania Press, 1949.
Lua MLA (9ú heag.)Githens, Thomas S 1878. Drug Plants of Africa. University of Pennsylvania Press, 1949.
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