Tracy, Brian
American Management Association, 2002
eBooks
Poissant, Charles-Albert
Pustaka Tangga, 1993
Buku Teks
Robbins, Anthony
A Freeside Book, 1991
Buku Teks
Maxwell, John C.
Harvest Publication House, 1997
Buku Teks
Maltz, Maxwell, 1899-1975
Interaksara, 2004
Buku Teks