Crum, William Leonard
University of California Press, 1953
Buku Teks SO
McCarty, F. William.
Irwin , 1990
Buku Teks
McCarty, F. William.
Irwin , 1993
Buku Teks
Hammer, Lawrence H.
South-Western Pub. Co, 1994
Buku Teks
Maynard, Lee
New York Washington Square Press 1988
Buku Teks