Columbia subject headings:
Human behavior.
Philosophy, Chinese.
Praxeology.
Yan, Yuan, 1635-1704.
Harvard subject headings:
Human behavior.
Philosophy, Chinese.
Praxeology
Yan, Yuan, 1635-1704
Princeton subject headings:
Human behavior.
Philosophy, Chinese.
Praxeology.
Yan, Yuan, 1635-1704.