Greene, Gardiner G., author
McGraw-Hill, 1975
Buku Teks
Entrepreneur Press Rich Mintzer
Entepreneur Press, 2011
Buku Teks
Fairbrothers, Gregg, author
Mc Graw-Hill , 2011
Buku Teks
Phillips, Patricia Pulliam, author
American Society for Training & Development, 2012
eBooks
Albert, Kenneth J., author
McGraw-Hill, 1981
Buku Teks