edited by Raven I. Mcdavid and Audrey R. Duckert
Foresman and Company,
Buku Teks
Jackson, Howard, 1945-
Routledge , 2002
Buku Teks SO
John Benjamins Pub, 2003
Buku Teks
edited by Robert F. Ilson
Philadephia John Benjamin Publishing, 1987
Buku Teks
Hartmann, Reinhard R.K.
Routledge, 1998
Buku Referensi