Abbasid+Caliphate+Essay+Bib.

"Abbasid." __Absoluteastronomy.com__. Wikipedia. 02 May 2009 [].

"THE POSTCLASSICAL PERIOD, 500-1500 - THE MIDDLE EAST AND NORTH AFRICA, 500-1500 - THE RISE AND EXPANSION OF ISLAM, 610-945 - THE ABBASID CALIPHATE AND ITS BREAKUP." __Http:web.ebscohost.com__. 2001. 02 May 2009 [] //.//

Williams, Kazzam. "Abbasid Caliphate." __Http:__web.ebscohost.com. 2007. 04 May 2009 [].

Corzine, Phyllis. __The Islamic Empire__. Thomson Gale, 2005 – page 56