Columbia subject headings:
Korean poetry--20th century--History and criticism.
Sijo--History and criticism.
Harvard subject headings:
Korean poetry--20th century--History and criticism
Korean poetry--21st century--History and criticism.
Sijo--Korea (South)--20th century--History and criticism.
Sijo--Korea (South)--21st century--History and criticism.
Princeton subject headings:
Korean poetry--20th century--History and criticism.
Sijo--History and criticism.