Kaplan, Burton, author
Prentice-Hall, 1996
Buku Teks
Maxwell, John C., author
Menuju Insan Cemerlang, 2014
Buku Teks
Brinkman, Rick, author
McGraw-Hill, 2003
Buku Teks
Marcic, Dorothy
Jossey-Bass, 1997
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Wiskup, Mark, author
American Management Association, 2007
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