Estop, Tora
[American Society for Training and Development Press;, ], 2005
eBooks
Catmull, Edwin
Random House Canada, 2014
Buku Teks
Ries, Eric, 1978
Portofolio Penguin, 2017
Buku Teks
Miller, Brian Cole
American Management Association;, 2008
eBooks
Rae, Leslie
McGraw-Hill, 1994
Buku Referensi