APA aipamena

Hardwick, M. (1972). Osprey guide to Gilbert and Sullivan. Osprey.

Chicago Style aipamena

Hardwick, Michael. Osprey Guide to Gilbert and Sullivan. London: Osprey, 1972.

MLA aipamena

Hardwick, Michael. Osprey Guide to Gilbert and Sullivan. Osprey, 1972.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.