Morehead, Albert H.. author
A Signet Book, 1962
Buku Referensi
N. A. L. Signet Books,
Buku Referensi
Mawson, C. O. Sylvester, author
Garden City Publishing Company, 1940
Buku Referensi
Penguin Books, 1987
Buku Referensi
edited by Robert L. Chapman
Harper Collins Publishers, 1992
Buku Referensi