Daugherty, Carroll R.
Houghton Miffiln, 1950
Buku Teks
Wicksteed, Philip Henry, 1844-1927, author
Augus M. Kelley, 1950
Buku Teks
Mill, John Stuart
Colonial Press, 1898
Buku Klasik
edited by James H. Weaver
Allyn and Bacon, 1973
Buku Teks
Mustafa Edwin Nasution; Uswatun Hasanah
Pusat Kajian Timur Tengah dan Islam, 2005
Buku Teks