Gould, William B., IV, author
MIT Press, 1982
Buku Teks
Twomey, David P.
South-Western Pub, 1985
Buku Teks
Leslie, Douglas L., author
West Publishing Company, 1979
Buku Teks
Jansen, Ernst P., author
Kluwer, 1994
Buku Teks
Leslie, Douglas L., author
West Publishing, 1992
Buku Teks