Hansen, R. D. (1979). Beyond the North-South stalemate. McGraw-Hill Book Co..
Chicago-čujuhus (17. p.)Hansen, Roger D. Beyond the North-South Stalemate. New York: McGraw-Hill Book Co., 1979.
MLA-čujuhus (9. p.)Hansen, Roger D. Beyond the North-South Stalemate. McGraw-Hill Book Co., 1979.
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