Columbia subject headings:
Harvard subject headings:
Cheng, Hao, 1032-1085--Chronology.
Cheng, Yi, 1033-1107--Chonology.
Neo-Confucianism.
Philosophers--China--Biography
Princeton subject headings:
Cheng, Hao, 1032-1085--Chronology.
Cheng, Yi, 1033-1107--Chonology.
Plilosophers--China--Biography.