Mousavi, Razieh S., and Petra G. Schmidl. “Al-Ashraf ῾Umar’s Tabṣira, Chapter Xxiii: Timekeeping at Night by the Moon in 13th-Century Yemen and Beyond”. Suhayl. Journal for the History of the Exact and Natural Sciences in Islamic Civilisation, vol. 20, no. 20, Dec. 2023, pp. 7-42, https://raco.cat/index.php/Suhayl/article/view/422305.