Line, Maurice B., editor
Clive Bingley , 1967
Buku Teks
Reeves, Tom Kynaston, author
McGraw-Hill, 1981
Buku Teks
Conway, Mal, author
American Society for Training & Development Press, 2003
eBooks
Long, Lori, author
[American Society for Training and Development Press, American Society for Training and Development Press], 2000
eBooks
SEAMEO, 1997
Buku Teks