Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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