Quirke, Bill
McGraw-Hill, 1995
Buku Teks
Harvard Business School Press, 2003
Buku Teks
Palmer, Ian R.
McGraw-Hill, 2006
Buku Teks
Prentice-Hall, 2000
Buku Teks
Cowan, Stella Louise
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
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