Mulligan, James G., author
Allyn and Bacon, 1989
Buku Teks
Baye, Michael R., author
Irwin McGraw-Hill, 2000
Buku Teks
Carter, Ronald
Longman, 1991
Buku Teks
Harvard Business School Press, 1991
Buku Teks
Bingham, Robert C., author
McGraw-Hill, 1987
Buku Teks