Seager, Spencer L., author
West Publishing Company, 1994
Buku Teks
Seager, Spencer L., author
Thomson Brooks/Cole, 2008
Buku Teks
Ouellette, Robert J., author
Prentice-Hall, 1994
Buku Teks
Brown, William H., author
Saunders College, 1997
Buku Teks
Streitwieser, Andrew, author
Macmillan, 1981
Buku Teks