Artikel Jurnal
Muijzenberg, Otto van den
KITLV Press, 1992
Buku Referensi
edited by Astrik L. Gabriel
Mediaeval Institute, University of Notre Dame, 1974
Buku Teks
Ward, Dederick C.
Scarecrow Press, 1981
Buku Referensi
Faculty of Dentistry Medical and Dental University
Medical and Dental University , 1988
Buku Teks