Rivkin, Robert S.
Discus Books/Published By Avon, 1972
Buku Teks
Grant, George
Wolgemuth & Hyatt, Publishers, Inc, 1989
Buku Teks
Pfeffer, Leo
The Beacon Press, 1956
Buku Teks
Abraham, Henry J.
Oxford University Press, 1982
Buku Teks
Bonnicksen, Andrea L
Mayfield Publishing Company, 1982
Buku Teks