APA (7th ed.) Citation

Gierke, O. v. (1958). Political theories of the middle age. Beacon.

Chicago Style (17th ed.) Citation

Gierke, Otto von. Political Theories of the Middle Age. Boston: Beacon, 1958.

MLA (9th ed.) Citation

Gierke, Otto von. Political Theories of the Middle Age. Beacon, 1958.