Loux, Michael J., author
Routledge, 2002
Buku Teks
Pine, Jerome, author
McGraw-Hill, 1972
Buku Teks
McEachern, William A., author
South-Western College Publishing, 2000
Buku Teks
McEachern, William A., author
South-Western College Publishing, 1997
Buku Teks
McEachern, William A., author
South-Western College Publishing, 1988
Buku Teks