Columbia subject headings:
Harvard subject headings:
Korean poetry--To 1900--History and criticism
Music and literature.
Music--Korea--History and criticism
Sijo--History and criticism
Princeton subject headings:
Korea--History--Koryŏ period, 935-1392.
Korean poetry--To 1900--History and criticism.
Music and literature.
Music--Korea--History and criticism.
Sijo--History and criticism.