Columbia subject headings:
Harvard subject headings:
Gottfried, von Strassburg, active 13th century--Criticism and interpretation.
Hartmann, von Aue, active 12th century--Criticism and interpretation.
Literature, Medieval--History and criticism
Poetics
Wolfram, von Eschenbach, active 12th century--Criticism and interpretation.
Princeton subject headings:
Gottfried, von Strassburg, active 13th century--Criticism and interpretation.
Hartmann, von Aue, active 12th century--Criticism and interpretation.
Literature, Medieval--History and criticism.
Poetics.
Wolfram, von Eschenbach, active 12th century--Criticism and interpretation.