Ginn and Co., 1974
Buku Teks
Tillery, Bill W.
McGraw-Hill, Higher Education, 2007
Buku Teks
Merken, Melvin
Saunders College Publishing, 1993
Buku Teks
Hewitt, Paul G.
Addison-Wesley, 2010
Buku Teks
McCarthy, Francis W.
Allyn and Bacon, 1972
Buku Teks