Columbia subject headings:
Literacy--Europe--History--To 1500.
Literature, Medieval--History and criticism.
Oral tradition in literature.
Oral tradition--Europe--History--To 1500.
Harvard subject headings:
Green, D. H. (Dennis Howard), 1922-2008.
Literacy--Europe--History--To 1500.
Literature, Medieval--History and criticism
Oral tradition in literature.
Oral tradition--Europe--History--To 1500.
Princeton subject headings:
Literacy--Europe--History--To 1500.
Literature, Medieval--History and criticism.
Oral tradition in literature.
Oral tradition--Europe--History--To 1500.