Christenson, R. M. (1964). Challenge and decision: Political issues of our time. Harper & Row.
Cita Chicago (17th ed.)Christenson, Reo Millard. Challenge and Decision: Political Issues of Our Time. New York: Harper & Row, 1964.
Cita MLA (9th ed.)Christenson, Reo Millard. Challenge and Decision: Political Issues of Our Time. Harper & Row, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.