edited by Stephen J. Williams
John Wiley & Sons, 1980
Buku Teks
Pearman, William A. and Starr, Philip
New York : Garland Publishing, 1988,
Buku Referensi
Carlson, Rick, author
The Mosby , 1987
Buku Teks
Mooney, Gavin H., author
Harvester Wheatsheaf, 1994
Buku Teks
Saltman, Deborah, author
Harcourt Brace Jovanovich, 1991
Buku Teks