Citação norma APA

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

Citação norma Chicago

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

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.