Whitw
Buku Teks
Buku Teks
Epstein, Jennifer Cody
Viking, 2008
Buku Teks
Wircenski, Jerry L.
[American Society for Training and Development Press, American Society for Training and Development Press], 2005
eBooks
Theuns-de Boer, Gerda
KITLV Press, 2005
Buku Referensi