Moskal, Mary Kay, author
Guilford Press, 2006
Buku Teks
Segil, Larraine, author
[American Management Association, ], 2003
eBooks
Tiem, Darlene Van, author
[American Society for Training and Development Press;, ], 2005
eBooks
Artikel Jurnal
Lendrum, Tony, author
McGraw-Hill, 1995
Buku Referensi