Moorehead, Alan
Harper and Brother, 1958
Buku Teks
Tung Desem Waringin
Gramedia Pustaka Utama, 2005
Buku Teks
Lahsasna, Ahcene
CERT publications, 2012
Buku Teks
Katcher, Bruce L.
[American Management Association;, ], 2010
eBooks
Rickertsen, Rick
[American Management Association, ], 2001
eBooks