APA aipamena

Butler, L. (1971). Art of the possible. Hamish Hamilton.

Chicago Style aipamena

Butler, Lord. Art of the Possible. Hamish Hamilton, 1971.

MLA aipamena

Butler, Lord. Art of the Possible. Hamish Hamilton, 1971.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.