Amitai, Reuven. “Armies and their Economic Basis in Iran and the Surrounding Lands, ca. 1000 -1500 C.E..” In David O. Morgan and Anthony Reid, eds. The New Cambridge History of Islam , vol. 3: The Eastern Islamic World Eleventh to Eighteenth Centuries, 539-560. Cambridge: Cambridge University Press, 2010. Copy at http://www.tinyurl.com/y26bhqrg