Grabar, Oleg. "Graffiti or Proclamations: Why Write on Buildings?" In Islamic Art and Beyond, volume III, Constructing the Study of Islamic Art. Hampshire: Ashgate Publishing Limited, 2006. First published in Doris Behrens-Abouseif, ed., The Cairo Heritage (Cairo, 2000), pp. 69-75.
Islamic Art and Beyond Part Two: General Islamic Architecture Chapter XVII: Graffiti or Proclamations