Bejan, Adrian, 1961-
Wiley, 2016
Buku Teks
Benson, Rowland S.
Pergemon Press, 1977
Buku Teks
Balzhiser, Richard E.
Prentice Hall of India, 1977
Buku Teks
Haberman, William L., 1922-
Boston: Allyn and Bacon, 1980
Buku Teks
Spalding, D.B.
The English Language, 1982
Buku Teks