Hansen, Don R., author
South-Western College, 2000
Buku Teks
Hansen, Don R., author
South-Western College Publishing, 1997
Buku Teks
Hansen, Don R., author
South-Western College Publishing, 1997
Buku Teks
Carter, William K., 1951-, author
Dame/Thomson Learning, 2002
Buku Teks
Hammer, Lawrence H., author
South-Western, 1993
Buku Teks