Woll, Peter
Little, Brown & Co., 1979
Buku Teks
Pak, Un-bong, 1960-, author
Silcheon, 2003
Buku Teks
Artikel Jurnal
Cochrane, Susan H., author
Johns Hopkins University Press, 1979
Buku Teks
Phillips, Jack J., author
American Society for Training & Development, 2009
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