Donzel, E. Van
Islamic desk reference
E.J. Brill, 1994
 Buku Referensi
Political handbook of the world 1997
edited by Arthur S. Banks, Alan J. Day, Thomas C. Muller
CSA Publications, 1997
 Buku Referensi
Ingpen, Robert
Encyclopedia of world events : eighty turning points in history
Dragon's World, 1995
 Buku Referensi
Philip's world reference atlas
Chancellor , 2001
 Buku Referensi
The world reference encyclopedia / foreword by J.K. Galbraith
Octopus Books, 1979
 Buku Referensi