Columbia subject headings:
Warrāq, Maḥmūd ibn al-Ḥasan, -approximately 844--Criticism and interpretation.
Warrāq, Maḥmūd ibn al-Ḥasan, -approximately 844--Ethics.
Warrāq, Maḥmūd ibn al-Ḥasan, -approximately 844--Religion.
Harvard subject headings:
Warrāq, Maḥmūd ibn al-Ḥasan, -approximately 844--Criticism and interpretation.
Princeton subject headings:
Warrāq, Maḥmūd ibn al-Ḥasan, -approximately 844--Criticism and interpretation.