Addison-Wesley, 1987
Buku Teks
Lasserre, Phillippe
Singapore Institute of Management, 1986
Buku Teks
Haneberg, Lisa
American Management Association, 2008
eBooks
Artikel Jurnal
edited by Alex E. Fernandez Jilberto and Andre Mommen
Routledge, 1996
Buku Teks