Quirke, Bill, author
McGraw-Hill, 1995
Buku Teks
Kissler, Gary D., author
Addison-Wesley, 1991
Buku Referensi
Prentice-Hall, 2000
Buku Teks
Cowan, Stella Louise, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks
Payne, Vivette, author
[American Management Association;, ], 2005
eBooks