Warner, Patricia K.
MacGraw-Hill, 1990
Buku Teks
Anderson, W.M. (Wendy M.)
Wiley Publishing , 2013
Buku Teks
Drummond, Gordon
Essex Longman, 1972
Buku Teks
Ehrlich, Eugene
McGraw-Hill , 2011
Buku Teks
Huddleston, Rodney
Melbourne University Press, 1984
Buku Teks