Kaushik, R.K., author
SS. Mubaruk and Bross, 1995
Buku Teks
Kneen, W.R., author
The English Language Book Society, 1974
Buku Teks
Helmprecht, H.L., author
McGraw-Hill, 1977
Buku Teks
Malone, Leo J., author
John Wiley & Sons, 1981
Buku Teks
Roach, Don, author
McGraw-Hill, 1979
Buku Teks