Dobson, Michael S.
American Management Association, 2011
eBooks
Hackos, JoAnn T.
John Wiley & Sons, 1994
Buku Referensi
Mecklenburg, Robert William.
O'Reilly, 2005
Buku Teks
Oram, Andrew
O'Reilly & Associates, Inc., 1991
Buku Teks
Davenport, Teresa
American Society for Training & Development, 2001
eBooks