Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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