APA aipamena

Butterfield, H., & Watson, A. The origins of history. London.

Chicago Style aipamena

Butterfield, Herbert, and Adam Watson. The Origins of History. c1981: London.

MLA aipamena

Butterfield, Herbert, and Adam Watson. The Origins of History. London.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.