Knapp, Michael C., author
Ohio South-Western, 1998
Buku Teks
Samuels, John M., author
McGraw-Hill, 1989
Buku Teks
Porter, Gary A., 1950-, author
South-Western, 2001
Buku Teks
Warren, Carl S., author
Thomson, 2005
Buku Teks
Hermanson, Roger H., author
BPI Irwin, 1989
Buku Teks