Vardaman, George T.
Auerbach Publishers, 1973
Buku Teks
Sindell, Milo, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
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edited by Claudia Peus, Susanne Braun, Birgit Schyns
Emerald, 2016
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Artikel Jurnal
Cohen, William A., author
American Management Association, 2006
eBooks