edited by C. Grove Haines
John Hopkins Press, 1956
Buku Teks
Fordham, Paul
Penguin Books, 1972
Buku Teks
The American Society of African Culture, 1966
Buku Teks
Carter, Gwendolen M., author
Frederick A. Praeger, 1961
Buku Teks
Kohn, Hans, author
D. Van Nostrand, 1965
Buku Teks