Columbia subject headings:
Harvard subject headings:
Ballads, Korean--History and criticism.
Kasa--History and criticism
Korean poetry--To 1900--History and criticism
Sijo--History and criticism
Princeton subject headings:
Changga--History and criticism.
Hyangga--History and criticism.
Korean poetry--Koryŏ period, 935-1392--History and criticism.
Korean poetry--To 935--History and criticism.