APA (7th ed.) Zitazioa

Penn, R. (2016). The Man Who Made Things Out of Trees. Penguin.

Chicago Style (17th ed.) Zitazioa

Penn, Robert. The Man Who Made Things Out of Trees. Penguin, 2016.

MLA (9th ed.) Zitazioa

Penn, Robert. The Man Who Made Things Out of Trees. Penguin, 2016.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.