Bostwick, Burdette E., author
John Wiley & Sons, 1981
Buku Teks
Eyre, Vivian, author
Learning Express, 2000
Buku Teks
Fry, Ron, author
Career Press, 2002
Buku Teks
Fletcher, John, author
Duckworth, 1973
Buku Teks
Grosse, Eric F., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2002
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