APA aipamena

Asimov, I. (1987). Foundation and earth. Grafton Books.

Chicago Style aipamena

Asimov, Isaac. Foundation and Earth. Grafton Books, 1987.

MLA aipamena

Asimov, Isaac. Foundation and Earth. Grafton Books, 1987.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.