Connelly, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks
edited by Jean M. Fredette
Writer`s Digest Books, 1988
Buku Teks
edited by Barry Turner
Macmillan, 1995
Buku Referensi
Hacker, Diana
Bedford Books of St. Martin?s Press, 1995
Buku Teks
James Cook University of North Queensland
James Cook University, 1993
Buku Referensi