McEachern, William A., author
South-Western College Publishing, 2000
Buku Teks
McEachern, William A., author
South-Western College Publishing, 1997
Buku Teks
Fischer, Stanley, author
McGraw-Hill, 1988
Buku Teks
Harvey, Jack, 1917-, author
Macmillan, 1973
Buku Teks
Rowan, D.C., author
Macmillan, 1968
Buku Teks