1927-1962, Haykal, Muḥammad Ḥasanayn ; Aḥmad, Shaik̲h̲ Muḥammad. Abū Bakr : sīrat Ḥaẓrat Abū Bakr, Ṣiddīq-i Akbar. Maktabah-yi Jadīd, 1957.