Harrell, Thomas W.
South-Western Publishing, 1961
Buku Teks
McCarthy, John Joseph, 1909-2005
McGraw-Hill, 1978
Buku Teks
edited by Tan Jing Jee & You Poh Seng with Emily Ding
Addison-Wesley Publishing, 1987
Buku Referensi
Westwood, Roberta
American Society for Training & Development, 2011
eBooks
Koontz, Harold
McGraw-Hill , 1971
Buku Teks