एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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