Columbia subject headings:
Guan, Zhong, -645 B.C.--Periodicals.
Harvard subject headings:
China--History--Spring and Autumn period, 722 B.C.-481 B.C.--Periodicals.
Guan, Zhong, -645 B.C.--Periodicals.
Princeton subject headings:
Guan, Zhong, -645 B.C.--Periodicals.