edited by Robert S. Kaplan
Harvard Business Scholl Press, 1990
Buku Teks
Putnam, Lawrence H., author
Prentice-Hall, 1992
Buku Teks
Hall, Robert W., author
Dow Jone-Irwin , 1987
Buku Teks
Bovee, Courtland L., author
Pearson/Prentice Hall, 2007
Buku Teks
edited by W. T. Singleton
MTP Press Limited, 1979
Buku Teks