Schmidl, Petra. 9999. “Bearbeitung volkstümlicher Astronomischer Abhandlungen Aus Dem Mittelalterlichen arabisch–islamischen Kulturraum”. Frankfurt: Johann Wolfgang Goethe University, Frankfurt.

Schmidl, Petra. 2007. “Ashraf: Al‐Malik al‐Ashraf (Mumahhid al‐Dīn) ʿUmar Ibn Yūsuf Ibn ʿUmar Ibn ʿAlī Ibn Rasūl”. In The Biographical Encyclopedia of Astronomers, ed. Thomas al., 1:66-7. New York: Springer-Verlag.

Schmidl, Petra. 2007. “Fārisī: Muḥammad Ibn Abī Bakr al‐Fārisī”. In The Biographical Encyclopedia of Astronomers, ed. Thomas al., 1:357-59. New York: Springer-Verlag.

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.

Charette, François, and Petra Schmidl. 2004. “Al-Khwārizmī and Practical Astronomy in Ninth-Century Baghdad, the Earliest Extant Corpus of Texts in Arabic on the Astrolabe and Other Portable Instruments”. SCIAMVS 5: 101-98.

Charette, François, and Petra Schmidl. 2004. “Al-Khwarizmi and Practical Astronomy in Ninth-Century Baghdad: The Earliest Extant Corpus of Texts in Arabic on the Astrolabe and Other Portable Instruments”. SCIAMVS 5: 101-98.

Charette, François, and Petra Schmidl. 2001. “A Universal Plate for Timekeeping by the Stars by Ḥabash al‐Ḥāsib: Text, Translation and Commentary”. Suhayl 2: 107-59.

Schmidl, Petra, Peter Eisenhardt, Frank Linhard, and Kaisar Petanides. 1999. “Zur Bestimmung Der Qibla Mittels Der Winde”. In Der Weg Der Wahrheit: Aufsätze Zur Einheit Der Wissenschaftsgeschichte, Festgabe Zum 60. Geburtstag Von Walter G. Saltzer, 135-46. Hildesheim: Olms.

Schmidl, Petra. “Two Early Arabic Sources on the Magnetic Compass”. Journal of Arabic and Islamic Studies 1: 81-132.