Pietrusza, D. (2008). 1920: The year of the six presidents (Paperback edition first published in 2008 by Basic Books.). Basic Books.
Chicago Style aipamenaPietrusza, David. 1920: The Year of the Six Presidents. Paperback edition first published in 2008 by Basic Books. New York: Basic Books, 2008.
MLA aipamenaPietrusza, David. 1920: The Year of the Six Presidents. Paperback edition first published in 2008 by Basic Books. Basic Books, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.