Guralnick, Peter
Little, Brown and Company, 1994
Buku Teks
Thompson, Leon Whitey
Thompson , 1995
Buku Teks
Meyer, Kathy, author
[American Society for Training & Development;, ], 1997
eBooks
Shahraz, Qaisra, author
Mizan Publika, 2017
Buku Teks
Portland : Glimmer Train Inc
Majalah, Jurnal, Buletin