Columbia subject headings:
Jurisprudence.
Petrażycki, Leon, 1867-1931.
Sociological jurisprudence.
Sociology.
Harvard subject headings:
Jurisprudence
Petrażycki, Leon, 1867-1931.
Sociological jurisprudence.
Sociology.
Princeton subject headings:
Jurisprudence.
Petrażycki, Leon, 1867-1931.
Sociological jurisprudence.
Sociology.