Podgor, Ellen S., author
West Publishing, 1993
Buku Teks
Mills, C. Wright, author
Oxford University Press, 1951
Buku Teks
Sutherland, Edwin H., author
Yale University Press, 1983
Buku Teks
Lawrence M. Salinger, editor
Sage Reference, 2013
Buku Referensi
Brickey, Kathleen F., author
Litt;e, Brown, 1995
Buku Teks