Columbia subject headings:
Hadith--Criticism, interpretation, etc.
Shāfiʻī, Muḥammad ibn Idrīs, 767 or 768-820. Risālah.
Harvard subject headings:
Islamic law.
Shāfiʻī, Muḥammad ibn Idrīs, 767 or 768-820. Risālah fī uṣūl al-fiqh.
Princeton subject headings:
Hadith--Criticism, interpretation, etc.
Hadith--History.