APA (7th ed.) Zitazioa
Roberts, D. D. (1973). The existential graphs of Charles S. Peirce. Mouton.
Chicago Style (17th ed.) Zitazioa
Roberts, Don D. The Existential Graphs of Charles S. Peirce. The Hague: Mouton, 1973.
MLA (9th ed.) Zitazioa
Roberts, Don D. The Existential Graphs of Charles S. Peirce. Mouton, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.