Victoria University of Wellington, 2007
Buku Teks
Sommer, Robert, author
New York, 2002
Buku Teks
edited by Ronald J. Prinz
Jessica Kingsley, 1991
Buku Teks
Ramsay, Michael C., author
John Wiley & Sons, 2002
Buku Teks
edited by Michael Harris Bond
Sage, 1988
Buku Teks