Artikel Jurnal
Rawlinson, J. Geoffrey, author
Gower, 1981
Buku Teks
Ambrose, Gavin, author
Bloomsbury Academic, 2015
Buku Teks
Vrooman, Rona J., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2000
eBooks
Birch, Paul, author
Erlangga, 2001
Buku Teks