Artikel Jurnal
Edited by Laura S. Etheredge
Britannica Educational Pub. in association with Rosen Educational Services, 2010
Buku Teks
Lapidus, Ira M., author
Cambridge University Press, 2014
Buku Teks
Coulson, Noel J., author
AldineTransaction, 2011
Buku Teks
Brockelmann, Carl, author
Routledge & Kegan Paul , 1950
Buku Teks