Keeble, Richard, author
Routledge, 2001
Buku Teks
Ottensmeyer, Edward J., author
McGraw-Hill, 1996
Buku Teks
edited by Gary Edson
Routledge , 1997
Buku Teks
Lockridge, Laurence S., author
Cambridge University Press, 1989
Buku Teks
Ian E. Thompson [and others]
Elsevier, 2006
Buku Teks