Sanday, A.P., author
Hodder and Stoughton, 1979
Buku Teks
Hart, Andrew, author
Routledge, 1997
Buku Referensi
Morris, Kenneth M., author
Lightbulb Press, 1998
Buku Referensi
Thorn, Eric A., author
Jay Books, 1989
Buku Referensi
Flick, Ernest W., author
Noyes Publications, 1987
Buku Referensi