Wenzler-Cremer, Hildegard, author
Gramedia Widia Sarana Indonesia, 1999
Buku Teks
Erteschik-Shir, Nomi, author
Cambridge University Press, 2006
Buku Teks
Grosse, Eric F., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2002
eBooks
Miller, James E., author
Willowgreen, 1998
Buku Teks
Macnamara, Jim, author
Prentice Hall Australia, 1996
Buku Teks