Guralnick, Peter
Little, Brown and Company, 1994
Buku Teks
Thompson, Leon Whitey
Winter Book, 1995
Buku Teks
Sanderson, Brandon
Mizan Publika, 2017
Buku Teks SO
Meyer, Kathy
[American Society for Training & Development;, ], 1997
eBooks
Sanderson, Brandon
Mizan Fantasi, 2017
Buku Teks SO