Longman, 1993
Buku Teks
Curran, Stuart
Oxford University Press, 1986
Buku Teks
Joel Faflak and Julia M. Wright, editors
Wiley Balckwell, 2016
Buku Teks
Thomas, Sophie
Routledge, 2008
Buku Teks
edited by Alvin Sullivan
Greenwood Press, 1986
Buku Referensi