Whitman, Douglas
Random House , 1985
Buku Teks
McCarty, F. William.
Irwin , 1993
Buku Teks
McCarty, F. William.
Irwin , 1990
Buku Teks
Buttler, Henry N.
South-Western Publishing Co., 1987
Buku Teks
Blackburn, John D., author
Richard D. Irwin , 1985
Buku Teks