Crainer, Stuart, author
Capstone, 1997
Buku Teks
Bloomsbury , 2002
Buku Referensi
A & C Black Publishers, 2006
Buku Referensi
Atwood, Christee Gabour, author
ASTD Press, 2009
Buku Teks
Atwood, Christee Gabour, author
American Society for Training & Development, 2009
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