Langer, William L. (William Leonard), 1896-1977 ; Mihr, G̲h̲ulām Rasūl, 1895-1971 (1958) Insāʼiklopīḍiyā tārīk̲h̲-i ʻālam jild avval tārīk̲h̲-i islām. Shaiḵẖ G̱ẖulām Alī Ainḍ Sanz. ISBN: .