Burns, Tom, author
Sage Publications, 2003
Buku Teks
Barnes, Rob, author
Routledge, 1996
Buku Teks
Williams, Kate
MacMillan Press , 1989
Buku Teks
Pauk, Walter, author
Houghton Mifflin, 1984
Buku Teks
McWhorter, Kathleen T., author
Pearson/Longman, 2007
Buku Teks