Younger, Sandra Millers, author
American Society for Training and Development Press, 1997
eBooks
Laird, Donald A., author
McGraw-Hill, 1957
Buku Teks
Hansten, Ruth I, author
EGC , 2001
Buku Teks
Kelly, Patricia, author
Delmar Cengage Learning, 2011
Buku Teks
Tracy, Brian, author
American Management Association, 2013
eBooks