Fournies, Ferdinand
McGraw-Hill, 2003
Buku Teks
Farber, Barry J.
Entrepreneur Press, 2013
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1994
UI - Skripsi Membership
Jobber, David
Prentice-Hall, 2000
Buku Teks
Lambert, Brian W.
American Society for Training & Development, 2009
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