APA (7th ed.) Zitazioa
Sayward, C. (2009). Dialogues concerning natural numbers. Peter Lang.
Chicago Style (17th ed.) Zitazioa
Sayward, Charles. Dialogues Concerning Natural Numbers. New York: Peter Lang, 2009.
MLA (9th ed.) Zitazioa
Sayward, Charles. Dialogues Concerning Natural Numbers. Peter Lang, 2009.
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