Wilkinson, Frances C.
Libraries Unlimited, 2003
Buku Teks
Davidson, Jeff
Prenada, 2010
Buku Teks
Sadgrove, Kit
Routledge, 2015
eBooks
edited by Pamela S. Cenzer; Cynthia I. Gozzi
The Hawork Press , 1991
Buku Teks
Bond, Cecil J.
McGraw-Hill, 1993
Buku Referensi