Cravalho, Ernest G., author
Pitman, 1981
Buku Teks
Spalding, D.B., author
The English Language, 1982
Buku Teks
Shavit, Arthur, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Mark, Melvin, author
Allyn and Bacon, 1979
Buku Teks
Choudhury, T. Roy, author
Tata McGraw-Hill, 1973
Buku Teks