1133. Concise Encyclopaedia of Arabic Civilization. 2 vols. Amsterdam: Djambatan, 1959. [Articles: p. 25, al-Afdal; p. 63, Assassins; p. 86, Batinites; p. 76, Badr al-Jamali; p. 100, Brethren of Purity; p. 147, Druzes; p. 169, Fatimids; p. 174, Fida'i; p. 198, al-Hakim; p. 265, Jawhar al-Siqilli; p. 253, Isma'ilites.]