Dornan, Jim, author
Network TwentyOne Indonesia, 2006
Buku Teks
Billy Boen, author
B. first, 2012
Buku Teks
Kim, Byung-Wan
Noura Books, 2014
Buku Teks
Kunkel, Vicki, author
American Management Association, 2009
eBooks
Cossman, Joe
Prenhallindo , 1997
Buku Teks