Sheehan, Brian, author
PowerHouse Books, 2013
Buku Teks
Bhote, Keki R., author
[American Management Association;, ], 2000
eBooks
Collins, Joseph, author
Grove Press, 1986
Buku Teks
Whitney, Hunter, author
Elsevier, 2013
Buku Teks
by Steven L. Spiegel [and others]
Thomson Wadsworth, 2005
Buku Teks