Eisenstatt, S.N.
Routledge & Kegan Paul, 1954
Buku Teks
Leslie, Donald Daniel
E.J. Brill , 1972
Buku Teks SO
Hitti, Philip Khuri, 1886-1978
Macmillan, 1951
Buku Teks
Rifyal Ka`bah
Universitas Indonesia, 2006
Buku Teks
Learsi, Rufus
The World, 1949
Buku Teks SO