Bayt, Phyllis Theiss
Glencoe Publishing Company, 1982
Buku Teks
Humphries, Judith
Kogan Page, 1994
Buku Teks
Tulloch, Mitch
McGraw-Hill, 2000
Buku Referensi
Overfield, Karen
American Society for Training & Development, 1997
eBooks
Overfield, Karen
[American Society For Training & Development;, ], 1997
eBooks