Gaynor, Gerard H.
McGraw - Hill, 1993
Buku Teks
Mancini, Marc
McGraw-Hill, 2003
Buku Teks
Webber, Ross A.
Van Nostrand Reinhold, 1972
Buku Teks
Fakultas Teknik Universitas Indonesia, 1996
UI - Skripsi (Membership)
Downs, Lisa J.
American Society for Training & Development, 2008
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