Hoban, James P., author
Allyn and Bacon, 1990
Buku Teks
Boone, Louis E., author
Dryden Press, 1996
Buku Teks
Boone, Louis E., author
Dryden Press, 1990
Buku Teks
Hampton, David R., author
McGraw-Hill, 1981
Buku Teks
Bovee, Courtland L., author
Richard D. Irwin, 1989
Buku Teks