Tuomi, I Ikka
Metaxis, 1999
Buku Teks
Kotter, John P., 1947-, author
Gramedia Pustaka Utama, 1997
Buku Teks
Gilley, Jerry W, author
Perseus Books, 2000
Buku Teks
McArdle, Geri, author
American Society for Training & Development, 2006
eBooks
McGraw-Hill , 2003
Buku Teks