Hughes, Richard L., author
McGraw-Hill, 2006
Buku Teks
Hughes, Richard L., author
Irwin/McGraw-Hill, 1999
Buku Teks
Sindell, Milo, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks
Vardaman, George T.
Auerbach Publishers, 1973
Buku Teks
Kotter, John P., 1947-, author
The Free Press, 1990
Buku Teks