Fisher, A. G. B. (1966). The clash of progress and security. A. M. Kelley.
Cita Chicago (17th ed.)Fisher, Allan George Barnard. The Clash of Progress and Security. New York: A. M. Kelley, 1966.
Cita MLA (8th ed.)Fisher, Allan George Barnard. The Clash of Progress and Security. A. M. Kelley, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.