Kelly, Gary F.
The Dushkin Publishing Group, 1992
Buku Teks
Hogan, Rosemarie Mihelich, author
Appleton-Century Crofts, 1980
Buku Teks
Rontledge, 1997
Buku Teks
edited by Edwin Ardener
Tavistock , 1971
Buku Teks
Cooper, Robert L., author
Cambridge University Press, 1989
Buku Teks