Hunt, John W., author
McGraw-Hill, 1976
Buku Teks
Harvard Business School Press, 1999
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1999
UI - Skripsi (Membership)
Schneider, Susan C., author
Prentice-Hall, 1997
Buku Teks
Jackson, Susan E., author
South Westh Western College, 2000
Buku Teks