Bell, Steven J
American Library Association, 2007
Buku Teks
Sommer, Robert
Oxford University Press, 2001
Buku Teks
Woefel, Charles J.
Propus Publishing, 1986
Buku Teks
Baldoni, John, 1952-
[American Management Association, ], 2013
eBooks
edited by Michael McCarthy
Cambridge University Press, 2016
Buku Teks