Cita APA (7th ed.)

Gierke, O. v. (1951). Political theories of the middle age. Cambridge University.

Cita Chicago (17th ed.)

Gierke, Otto von. Political Theories of the Middle Age. Londres: Cambridge University, 1951.

Cita MLA (9th ed.)

Gierke, Otto von. Political Theories of the Middle Age. Cambridge University, 1951.