Devito, Joseph A., author
Harper and Row, 1984
Buku Teks
Floyd, Kory, author
McGraw-Hill, 2015
Buku Teks
Payne, James, author
Illinois National Textbook, 1994
Buku Teks
Zarefsky, David, author
Allyn and Bacon, 2011
Buku Teks
by Kathleen German ... [and others]
Longman, 2001
Buku Teks