Lua APA (7ú heag.)
Sayward, C. (2009). Dialogues concerning natural numbers. Peter Lang.
Lua i Stíl Chicago (17ú heag.)
Sayward, Charles. Dialogues Concerning Natural Numbers. New York: Peter Lang, 2009.
Lua MLA (9ú heag.)
Sayward, Charles. Dialogues Concerning Natural Numbers. Peter Lang, 2009.
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