Connelly, James F., author
Macmillan, 1978
Buku Teks
Ewen, Dale, author
Thomson Brooks/Cole, 2007
Buku Teks
Ewen, Dale, author
Prentice-Hall, 1983
Buku Teks
Stark, Thomas J., author
Benjamin Cumming, 1984
Buku Teks
Hafstrom, John E., author
Addison-Wesely, 1961
Buku Teks