APA (7th ed.) Zitazioa
Sawyer, W. W. (1955). Prelude to Mathematics (1a. ed.). Pelican books.
Chicago Style (17th ed.) Zitazioa
Sawyer, W. W. Prelude to Mathematics. 1a. ed. Londres: Pelican books, 1955.
MLA (9th ed.) Zitazioa
Sawyer, W. W. Prelude to Mathematics. 1a. ed. Pelican books, 1955.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.