Columbia subject headings:
Wolfram, von Eschenbach, active 12th century. Willehalm. Book 9.
Harvard subject headings:
Wolfram, von Eschenbach, active 12th century. Willehalm. Book 9.
Wolfram, von Eschenbach, active 12th century. Willehalm. Buch 9.
Princeton subject headings:
Wolfram von Eschenbach, 12th cent. Willehalm. Book 9.