Bell, Allan, 1947-, author
Wiley Blackwell, 2014
Buku Teks
Hudson, R. A., author
Cambridge , 1980
Buku Teks
edited by Oscar Uribe-Villegas
Mouton, 1977
Buku Teks
Wardhaugh, Ronald, author
Blackwell Publishers, 2002
Buku Teks
Meyerhoff, Miriam, author
Rontledge, 2006
Buku Teks