Singh, R. P. (Ramesh Prasad)
Gulf Professional, 2013
Buku Teks
Bai, Yong
Elsevier, 2014
Buku Teks
Ellenberger, Phillip
Elesevier, 2010
Buku Teks
edited by Tyler G. Hicks
McGraw-Hill, 1986
Buku Referensi
Fein, Melissa
American Society for Training & Development, 2012
eBooks