BIBLIOGRAPHY CONTRIBUTOR Imam Ahmad First name Imam Last name Ahmad Bibliography entries by this contributor Al-Bīrūnī, Abū. 1965. Al-Maqāla Al-Thālitha Min Al-Qānūn Al-Masʿūdī. Ed. Imam Ahmad. Al-Qāhira. Ahmad, Imam. 1962. “Ai-Bīrūnī's Astronomical Works. Piii”. Helwan Observatory Bulletin. Ahmad, Imam. 1959. “Ai-Bīrūnī's Astronomical Works”. Helwan Observatory Bulletin. Ahmad, Imam. 1959. “The Works Of Al-Bayrouni. P. Ii”. Helwan Observatory Bulletin.