Akhademisajok, 2007
Buku Referensi
Zuckerman, Harriet, author
The Free Press, 1977
Buku Teks
Pausch, Randy, author
Hodder & Stoughton, 2008
Buku Teks
Bagchi, Asoke K., author
Toppan Company, 1988
Buku Referensi
Michael Worek, editor
Firefly Books Ltd., 2008
Buku Teks