APA aipamena

Lees, J. D. (1969). Political system of the united states.

Chicago Style aipamena

Lees, John D. Political System of the United States. 1969.

MLA aipamena

Lees, John D. Political System of the United States. 1969.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.