APA aipamena

Geographic, N. (2008). Os seis graus. National Geographic.

Chicago Style aipamena

Geographic, National. Os Seis Graus. National Geographic, 2008.

MLA aipamena

Geographic, National. Os Seis Graus. National Geographic, 2008.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.