Sugars, Bradley J.
McGraw-HIll , 2006
Buku Teks
Johnson, Spencer
Harper Collins, 2004
Buku Teks
Gamble, Teri Kwal
American Society for Training & Development, 2007
eBooks
Lapp, Charles L.
McGraw-Hill, 1957
Buku Teks
Rodgers, Mark
McGraw-Hill , 2011
Buku Teks