APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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