Columbia subject headings:
Didactic literature--History and criticism.
Literature, Medieval--History and criticism.
Romance-language literature--History and criticism.
Harvard subject headings:
Didactic literature--History and criticism.
Literature, Medieval--History and criticism
Romance-language literature--History and criticism.
Princeton subject headings:
Didactic literature--History and criticism.
Literature, Medieval--History and criticism.
Romance-language literature--History and criticism.