Eastop, T.D. (Thomas D.), author
Wiley, 1994
Buku Teks
Todd, James P., author
John Wiley & Sons, 1981
Buku Teks
Balzhiser, Richard E., author
Prentice Hall of India, 1977
Buku Teks
Haberman, William L., 1922-, author
Boston: Allyn and Bacon, 1980
Buku Teks
Spalding, D.B., author
The English Language, 1982
Buku Teks