APA (7th ed.) Citation

Skillen, H. (1989). Spies of the airwaves: A history of Y sections during the Second World War. Privately printed.

Chicago Style (17th ed.) Citation

Skillen, Hugh. Spies of the Airwaves: A History of Y Sections During the Second World War. Pinner: Privately printed, 1989.

MLA (8th ed.) Citation

Skillen, Hugh. Spies of the Airwaves: A History of Y Sections During the Second World War. Privately printed, 1989.