Englert, Robert D., author
McGraw-Hill, 1990
Buku Teks
Harvard Business School Press, 2001
Buku Teks
Heldman, Robert K., author
McGraw-Hill, 1993
Buku Teks
Bright, James R., author
R. D. Irwin , 1964
Buku Teks
Ayres, Robert U., author
McGraw-Hill, 1969
Buku Teks