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
Thomas Y. Crowell Company, 1962
Buku Referensi
Longmans, 1962
Buku Referensi