edited by Eric Knorr
Peachpit Press, 1994
Buku Teks
Cook, Stanley
Penguin Book, 1945
Buku Teks
Stevenson, Burton, author
New York, Harper & Brothers
Buku Referensi
Drosnin, Michael
Simon & Schuster, 1998
Buku Teks
Ehrlich, J. W., author
Oceana Publications, 1962
Buku Teks