Vaughn, Robert H., author
ASTD Press, 2010
Buku Teks
Vaughn, Robert H., author
American Society for Training & Development, 2010
eBooks
Foskett, Nicholas, author
Routledge, 2001
Buku Teks
Ibnu Syamsi, author
Bina Aksara, 1989
Buku Teks
Radford, K.J., author
Prushin-Hall, 1974
Buku Teks