Justice M. Taqui Usmani
Rightway Publication, 2002
Buku Teks SO
edited by Peter Clarke
Routledge, 1990
Buku Teks SO
World Assembly of Muslim Youth, s.a.
Buku Teks SO
Azim A. Nanji, editor
Gale Research, 1996
Buku Referensi
Spuler, Bertold
E.J. Brill, 1960
Buku Teks SO