Decker, Randall E.
Little, Brown And Company, 1980
Buku Teks SO
Rorabacher, Louise E.
Harper & Row Publishers, 1985
Buku Teks SO
Leki, Ilona
Cambridge University Press, 1998
Buku Teks SO
Zinsser, William
Harper Collins, 1990
Buku Teks SO
Goddard, Ken
The Bath Press, 1995
Buku Teks SO