Schmidl, Petra. 2007. “ʿUrḍī: Muʾayyad (al‐Milla wa‐) al‐Dīn (Muʾayyad Ibn Barīk [Burayk]) al‐ʿUrḍī (al‐ʿĀmirī al‐Dimashqī)”. In The Biographical Encyclopedia of Astronomers, ed. Thomas al., 2:1161-62. New York: Springer-Verlag.