Watt, William Montgomery, author
Sidwick and Jackson, 1976
Buku Teks
Kislov, A., author
Sterling Publishers Private, 1984
Buku Teks
England : The Islamic Press Agency
Majalah, Jurnal, Buletin
edited by Francis Robinson
Cambridge University Press, 1996
Buku Teks
Frampton, Kenneth, author
Thames & Hudson , 2001
Buku Teks