Twomey, David P.
South-Western Pub, 1985
Buku Teks
Jansen, Ernst P., author
Kluwer, 1994
Buku Teks
Jackson, Grdon E., author
Prentice-Hall, 1993
Buku Referensi
Edited by Matthew W. Finkin, Guy Mundlak
Edward Elgar Publishing, In, 2015
Buku Teks
James Atleson
Thomson West, 2008
Buku Teks