Lundberg, Erik, author
Yale University Press, 1968
Buku Teks
Frey, Bruno S., author
Princeton University Press, 2002
Buku Teks
Naqvi, Syed Nawab Haider, author
Islamic Foundation, 2003
Buku Teks
Kuznets, Simon Smith, 1901-, author
W.W. Norton&Company-Inc, 1965
Buku Teks
Becerra-Fernandez, Irma, author
Routledge, 2015
Buku Teks