Shank, John K.
Irwin, 1989
Buku Teks
Guan, Liming
South Western Cengage Learning, 2009
Buku Teks
Heitger, Lester E.
South-Western Publishing, 1992
Buku Teks
Schmiedicke, Albert E.
Ohio South-Western Publishing , 1988
Buku Teks
Gray, Jack
McGraww-Hill, 1982
Buku Teks