Liff, Stewart
American Management Association, 2007
eBooks
Dowling, William F.
McGraw-Hill Kogakusha, 1978
Buku Teks
editor, Cat Sharpe
[American Society for Training and Development Press, American Society for Training and Development Press], 2000
eBooks
McQuaiq, Jack H
Frederick Fell. Inc, 1973
Buku Teks
Tracy, Brian
Amacom, 2011
Buku Teks