Columbia subject headings:
Harvard subject headings:
Ballads, Ryukyuan--History and criticism.
Omoro sōshi.
Ryukyuan literature--History and criticism.
Ryukyuan literature--Research.
Princeton subject headings:
Ballads, Ryukyuan--History and criticism.
Omoro sōshi.
Ryukyuan literature--History and criticism.
Ryukyuan literature--Research.