Artikel Jurnal
Bagchi, Asoke K., author
Toppan Company, 1988
Buku Referensi
editor Martha Thorne [and others]
Harry N. Abrams, INC, Publisher, 1999
Buku Teks
Akhademisajok, 2007
Buku Referensi
Zuckerman, Harriet, author
The Free Press, 1977
Buku Teks