Anderson, Richard C., author
McGraw-Hill, 1960
Buku Teks
Swallow, Lisa, author
Wiley Publishing, Inc., 2009
Buku Teks
edited by Roodney A. Ellis
Routledge, Taylor & Francis Group, 2009
Buku Teks
Butterworth-Heinemann, 1993
Buku Teks
edited by Ron Zemke and John A. Woods
American Management Association, 1998
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