1. Berggren, J. L; “A Comparison of Four Analemmas for Determining the Azimuth of the Qibla.” Journal for the History of Arabic Science
4 (1) (1980), 69–80.
2. Berggren, J. L. “Spherical Trigonometry in the zīj of Kūshyār ibn Labbān”. In: Festschrift: A Volume of Studies of the History of Science in the Near East, Dedicated to E. S. Kennedy (D. A. King and G. Saliba, eds.) New York: New York Academy of Sciences (to appear). An English translation of the section in the zīj dealing with spherical trigonometry.
3. Bīrunī, Abu l-Rayhān (transl. by J. Ali). The Determination of the Coordinates of Cities. Beirut: American University of Beirut, 1967.
4. Debarnot, M.-Th. “Introduction du Triangle Polaire par Abū Nasr b. ‘Irāq.” Journal for the History of Arabic Science
2 (1) (1978), 126–136.
5. Kennedy, E. S. A Commentary Upon Bīrūnī’s Kitāb Tahdīd al-Amākin. Beirut: American University of Beirut, 1973, ( Commentary on Bīrūnī’s The Determination, etc. )