Still, Richard R.
Prentice-Hall, 1958
Buku Teks
Abu Hilwa Aijawa, author
Restu Agung, 2005
Buku Teks
Still, Richard R
Prentice Hall International, 1988
Buku Teks
Jones, John G., author
Alexander Hamilton Institute, 1961
Buku Teks
Ohai, Tim, author
American Society for Training & Development, 2008
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