edited by Di Lewis
Queensland University of Technology, 1999
Buku Teks
Aitchison, James, author
Cassell, 1994
Buku Teks
Sklare, Arnold B., author
McGraw-Hill, 1964
Buku Teks
Rougier, Harry, author
W.W. Norton, 1970
Buku Teks
Pechenik, Jan A., author
Longman , 2001
Buku Teks