APA-čujuhus (7. p.)
Marx, K., & Engels, F. (1973). Karl Marx and Frederick Engels: Selected Correspondence.
Chicago-čujuhus (17. p.)
Marx, Karl, juo Friedrich Engels. Karl Marx and Frederick Engels: Selected Correspondence. 1973.
MLA-čujuhus (9. p.)
Marx, Karl, juo Friedrich Engels. Karl Marx and Frederick Engels: Selected Correspondence. 1973.
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