edited by Robert W. Price
Dushkin/McGraw-Hill, 2000
Buku Teks
The British Council, 2001
Buku Referensi
The British Council, 2001
Buku Referensi
New York, 2002
Buku Teks
Faculty of Dentistry Medical and Dental University
Medical and Dental University , 1988
Buku Teks