Calder, N. (1978). Spaceships of the mind. British Broadcasting Corporation.
Cita Chicago (17th ed.)Calder, Nigel. Spaceships of the Mind. London: British Broadcasting Corporation, 1978.
Cita MLA (8th ed.)Calder, Nigel. Spaceships of the Mind. British Broadcasting Corporation, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.