Sarton, George, 1884-1956 ; Niyāzī, Sayyid Naz̲īr, 1900-1980 (1959) Muqaddamah-yi tārīk̲h̲-i sāʼins mujallad-i avval : Homar tā ʻUmar K̲h̲ayyām. Majlis-i Taraqqī-yi Adab. ISBN: .