Albert, Katherine
London: Simon & Schuster, 1996,
Buku Teks
Wright, Peter, author
Edinburgh University Press, 2006
Buku Teks
Haslam, Sara, author
Routledge, 2009
Buku Teks
McQuade, Donald, author
Alfred A. Knopf, 1983
Buku Teks
Gelb, Ignace Jay, author
The University of Chicago , 1963
Buku Teks