Pechenik, Jan A., author
Longman , 2001
Buku Teks
Mundhenk, Robert T., author
Houghton Mifflin, 1978
Buku Teks
Rathbone, Robert R., author
Addison-Wesley Publishing Company, 1985
Buku Teks
Lerner, Marcia, author
Random House, 2001
Buku Teks
Meyer, Michael, author
Little, Brown, 1982
Buku Teks