Cantor, Nathaniel, author
Harper & Brothers, 1958
Buku Teks
Harrell, Thomas W., author
South-Western Publishing, 1961
Buku Teks
McCarthy, John Joseph, 1909-2005, author
McGraw-Hill, 1978
Buku Teks
edited by Tan Jing Jee & You Poh Seng with Emily Ding
Addison-Wesley Publishing, 1987
Buku Referensi
Westwood, Roberta, author
American Society for Training & Development, 2011
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