APA (7th ed.) Citation

Gierke, O. (1968). Political theories of the middle age. Cambridge University Press.

Chicago Style (17th ed.) Citation

Gierke, Otto. Political Theories of the Middle Age. Cambridge University Press, 1968.

MLA (9th ed.) Citation

Gierke, Otto. Political Theories of the Middle Age. Cambridge University Press, 1968.

Warning: These citations may not always be 100% accurate.