Mulyadi S., author
Rajawali, 2012
Buku Teks
Wilson Bangun, author
Erlangga, 2012
Buku Teks
Cook, Mary F., author
Prentice-Hall, 1997
Buku Referensi
French, Wendell
Houghton Mifflin, 1974
Buku Teks
Cowan, Stella Louise, author
American Society for Training & Development, 2012
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