Podolinsky, Michael A, author
McGraw-Hill, 2013
Buku Teks
McClay, Renie, author
American Society for Training & Development, 2009
eBooks
Rivas-Micoud, Miguel, author
Media Global Edukasi, 2005
Buku Teks
Carr, Albert Z., author
New American Library, 1968
Buku Teks
Stapleton, James F., author
Erlangga, 2003
Buku Teks