Faculty of Dentistry Medical and Dental University
Medical and Dental University , 1988
Buku Teks
Gorki, Maxim, author
T. Werner Laurie, [Date of publication not identified]
Buku Teks
Snapper, Johan P.
University Press of America, 1989
Buku Teks
Whitaker, Joseph, author
J. Whitaker and Sons, 1987
Buku Referensi
Rajagukguk, Omas Bulan, author
Journal of Population, 1995
Artikel Jurnal