Martini, Frederic H., author
Pearson Education, 2006
Buku Teks
Khurana, Indu, author
Oxford University Press, 2010
Buku Teks
Jackson, Sheila M.
The English Language Book, 1979
Buku Teks
Tortora, Gerard J., author
Purdue University, 1998
Buku Teks
Tortora, Gerard J., author
Harper Collins, 1996
Buku Teks