Amadio, William, author
Mitchell Publishing, 1989
Buku Teks
Hussain, Khateeb , author
Prentice Hall Inc., 1973
Buku Teks
Heinich
Macmillan, 1989
Buku Teks
Davies, Ivor K., author
McGraw-Hill, 1981
Buku Teks
Merman, Stephen K., author
[American Society for Training and Development Press, American Society for Training and Development Press], 2002
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