edited by Robert F. Ilson
Philadephia John Benjamin Publishing, 1987
Buku Teks
edited by Raven I. Mcdavid and Audrey R. Duckert
Foresman and Company,
Buku Teks
Jackson, Howard, 1945-, author
Routledge , 2002
Buku Teks
edited by Sylviane Granger, Magali Paquo
Oxford University press, 2012
Buku Teks
Hartmann, Reinhard R.K., author
Routledge, 1998
Buku Referensi