Greenlaw, Paul S.
Harper & Row, 1986
Buku Teks
The Free Press, 1985
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1999
UI - Skripsi (Membership)
Schneider, Susan C.
Prentice-Hall, 1997
Buku Teks
Harvard Business School Press, 1999
Buku Teks