Taub, Alexander, author
McGraw-Hill Education, 2014
Buku Teks
Hartley, Darin, author
American Society for Training & Development, 2010
eBooks
Walford, Robert B.
Addison-Wesley Publishing Company, Inc., 1990
Buku Teks
Baber, Anne, author
American Management Association, 2007
eBooks
Daitel, H.M., author
Prentice-Hall, 2001
Buku Teks