Columbia subject headings:
Apostasy--Islam--Early works to 1800.
Islamic philosophy.
Muslims--Islamic Empire--Biography--Early works to 1800.
Rāwandī, Aḥmad ibn Yaḥyá, active 9th century.
Harvard subject headings:
Islamic philosophy.
Muslims--Islamic Empire--Biography
Rāwandī, Aḥmad ibn Yaḥyá, active 9th century. Criticism and interpretation.
Princeton subject headings:
Apostasy--Islam--Early works to 1800.
Islamic philosophy.
Muslims--Islamic Empire--Biography--Early works to 1800.
Rāwandī, Aḥmad ibn Yaḥyá, active 9th century.