Artikel Jurnal
edited by James Ward Smith and Leland Jamison
Princeton University Press, 1961
Buku Teks
Herriot, Peter, author
Routledge, 2007
Buku Teks
Clarke, Steve, 1964-, author
Wiley Balckwell, 2014
Buku Teks
Mohammad Iqbal, author
Kitab Publishing House, 1974
Buku Teks