Nasr, Raja T.
Longman, 1975
Buku Teks
Morris, I.
Macmillan and Co. Ltd., 1950
Buku Teks
Hasenfeld, Yeheskel
The University of Michigan Press, 1977
Buku Teks
Hewings, Martin
Cambridge University Press , 2004
Buku Teks
edited by Susan Brindley
Routledge, 1993
Buku Teks