Johannsen, R. W. (1966). Democracy on trial. McGraw-Hill.
Cita Chicago (17th ed.)Johannsen, Robert W. Democracy on Trial. New York: McGraw-Hill, 1966.
Cita MLA (9th ed.)Johannsen, Robert W. Democracy on Trial. McGraw-Hill, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.