Tobey, Deborah Davis, author
American Society for Training & Development, 2007
eBooks
Aubinet, Marc, editor
Springer, 2012
eBooks
Reed, Irving S., author
Kluwer Academic , 1999
Buku Teks
Thornton, J.E., author
Foresman, 1970
Buku Teks
Barney, George C., author
Prentice-Hall, , 1988"
Buku Teks