Pandit, Sudhakar M.
New York John Wiley and Sons 1983,
Buku Teks
Martin, James, author
Prentice-Hall, 1967
Buku Teks
Fishman, George S., author
John Wiley & Sons, 1993
Buku Teks
Fairclough, Norman, author
Rotledge, 2010
Buku Teks
Fairclough, Norman, author
Longman, 1997
Buku Teks