Bevan, Celia, author
Mosby, 1998
Buku Teks
Ahuja, Hira N., author
John Wiley & Sons, 1980
Buku Teks
Hartley, Darin, author
American Society for Training & Development, 2010
eBooks
Berger, Peter L., author
Allen Lane, 1966
Buku Teks
Rapley, Mark, author
Cambridge, , 2004
Buku Teks