Swift, Jeremy
The Sahara
Time-Life Internationa, 1975
Buku Teks
Stafford, J.
Boston Adventure
New York Harcourt, Brace and Company 1944
Buku Teks
Kagan, Robert A.
Philippe nonet phlip sedenick
Buku Teks
A Symposium on fertility in sub-sahara Africa
Washington, D.C :Worl bank, 1996.,
Buku Teks
Price, Willard
Underwater adventure / by Willard Price
The John Day Company, 1954
Buku Teks