Artikel Jurnal
Heimler, Charles H.
Charles E Merrill, 1977
Buku Teks
Redfield, Robert, author
The University of Chicago Press, 1962
Buku Teks
Maududi, Sayyid Abul A`la
Islamic Publication, 1967
Buku Teks
Sanders, Irwin T.
Ronald Press , 1966
Buku Teks