APA aipamena

Sawkins, F. J. (1978). The evolving earth. Macmillan.

Chicago Style aipamena

Sawkins, Frederick J. The Evolving Earth. Macmillan, 1978.

MLA aipamena

Sawkins, Frederick J. The Evolving Earth. Macmillan, 1978.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.