Weisskopf, Gene, author
Sybex, 1999
Buku Referensi
Muhamad Dzarin Fadhilah, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Skripsi (Membership)
Frisch, Michael H., author
[American Management Association, ], 2012
eBooks
Larsen, Ronald W., author
Prentice-Hall, 2002
Buku Teks
Dretzke, Beverly J., author
Prentice-Hall, 2001
Buku Teks