Simmons, Annette, author
American Management Association;;, 1998
eBooks
Carliner, Saul, author
ATD Press, 2015
Buku Teks
Dale, Margaret, author
Gramedia, 2003
Buku Teks
Rae, Leslie, author
Bhuana Ilmu Populer, 2005
Buku Teks
Mai, Robert, author
[American Management Association, ], 2003
eBooks