Alsayyad, Nezar.Cities and Caliphs. Greenwood, 1991. A history of the process by which Middle Eastern cities became Islamic and the role of the caliphs in shaping Islamic cities.
Nicolle, David, and Adam Hook.Armies of the Caliphates, 862-1098. Osprey, 1998. A military history of the Islamic armies--composed of the Arabs, Turks, Persians, North Africans, and others--that were among the preeminent military forces up to the time of the Crusades.