Guttridge, Bryan, author
John Wiley & Sons, 1973
Buku Teks
edited by William J. Cavanaugh and Joseph A. Wilkes
John Wiley & Sons, 1999
Buku Teks
Diane Fraser, editor
Churchill livingstone , 2000
Buku Teks
Simms, Lillian M., author
Delmar Publisher , 1985
Buku Teks
Kastantin, Joseph T., author
Quorum Books, 1988
Buku Teks