McNair, Brian, author
Routledge , 1996
Buku Teks
Underwood, Doug, author
Cambridge University Press, 2009
eBooks
Brooks, Brian S., author
Bedford/St. Martins,, 2002
Buku Teks
Artikel Jurnal
Broder, David S., author
Pustaka Sinar Harapan , 1993
Buku Teks