Lieberman, Jethro Koller.
Harcourt Brace Jovanovich, 1989
Buku Teks
Fisher, Bruce D, author
West Publishing Company, 1986
Buku Teks
Buttler, Henry N.
South-Western Publishing Co., 1987
Buku Teks
Blackburn, John D., author
Richard D. Irwin , 1985
Buku Teks
Lieberman, Jethro K.
Harcourt Brace Jovanovic, 1989
Buku Teks