APA (7th ed.) Zitazioa
Christian, D. (2011). Maps of time: An introduction to big history. University of California Press.
Chicago Style (17th ed.) Zitazioa
Christian, David. Maps of Time: An Introduction to Big History. Bekeley: University of California Press, 2011.
MLA (9th ed.) Zitazioa
Christian, David. Maps of Time: An Introduction to Big History. University of California Press, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.