Columbia subject headings:
Islam--Doctrines--Early works to 1800.
Motazilites.
Shafiites.
Harvard subject headings:
Islam--Doctrines--Early works to 1800.
Motazilites--Controversial literature--Early works to 1800.
Princeton subject headings:
Islam--Doctrines--Early works to 1800.
Motazilites.
Shafiites.