APA (7th ed.) Zitazioa
ebrary, Inc, & Powers, E. (2011). Freedom of speech: The history of an idea. Bucknell University Press.
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, eta Elizabeth Powers. Freedom of Speech: The History of an Idea. Lewisburg [Pa.]: Bucknell University Press, 2011.
MLA (9th ed.) Zitazioa
ebrary, Inc, eta Elizabeth Powers. Freedom of Speech: The History of an Idea. Bucknell University Press, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.