Langer, William L. (William Leonard), 1896-1977 ; Mihr, G̲h̲ulām Rasūl, 1895-1971 (1959) Insāʼiklopīḍīyā-i tārīk̲h̲-i ʻālam : tārīk̲h̲-i ʻumūmī. Shaik̲h̲ G̲h̲ulām ʻAlī Ainḍ Sanz. ISBN: .