Pearson, Paul B.
University of Arizona Press, 1980
Buku Teks
Austin, James E.
Gunn & Hani Publishers, Inc., 1981
Buku Teks
Joshi, Shubhangini A.
Tata McGraw-Hill, 1992
Buku Teks SO
Walker, Robin
New South Wales University Press, 1988
Buku Teks SO
Mehas, Kay Yockey
Glencoe/McGraw-Hill, 1997
Buku Teks