APA aipamena

Gettell, R. G. (1964). History of political thought (2nd ed.).

Chicago Style aipamena

Gettell, Raymond Garfield. History of Political Thought. 2nd ed. 1964.

MLA aipamena

Gettell, Raymond Garfield. History of Political Thought. 2nd ed. 1964.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.