Catlin, Avery, author
Prentice-Hall, 1992
Buku Teks
Guralnick, Peter
Little, Brown and Company, 1994
Buku Teks
Newby, Eric, author
Picador, 1989
Buku Teks
Liddell, Ken
Western Producer Prairie Books, 1977
Buku Teks
Russo, Cat Sharpe, author
[American Society for Training and Development Press, American Society for Training and Development Press], 1999
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