Horton, William, author
American Society for Training & Development Press, 2001
eBooks
Spero, Ken, author
American Society for Training & Development, 2012
eBooks
Artikel Jurnal
Wharton, Edith, author
Random House, 1994
Buku Teks
Sappington, Erin, author
American Society for Training & Development, 2010
eBooks