Christenson, R. M. (1964). Challence and decision: Political issues of our time. Harper & Row.
Chicago-čujuhus (17. p.)Christenson, Reo M. Challence and Decision: Political Issues of Our Time. Nueva York: Harper & Row, 1964.
MLA-čujuhus (9. p.)Christenson, Reo M. Challence and Decision: Political Issues of Our Time. Harper & Row, 1964.
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