Columbia subject headings:
Harvard subject headings:
Korea--Foreign relations--935-1392.
Negotiation--Korea--History--To 1500.
Sŏ, Hŭi, 942-998.
Princeton subject headings:
Korea--Foreign relations--935-1392.
Negotiation--Korea--History--To 1500.
Sŏ, Hŭi, 942-998.