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3. J. J. Rousseau A Discourse on the Origin and Foundations of Inequality. 1755. Transl. R. D. & J. R. Masters. New York: St Martin’s Press, 1964.
4. Adam Smith An Inquiry into the Nature and Causes of the Wealth of Nations. 1776. Ch. 8, “Of the Causes of Improvement in the Productive Powers of Labour.” Great Books of the Western World Vol.39. Encyclopedia Brittanica. Chicago. 1955.
5. Karl Marx Capital 1873. Transl. M. Sachey, H. Lamm Part 3, “The Production of Absolute Surplus Value.” Ed. F. Engels. Great Books of the Western World. Encyclopedia Brittanica, Chicago, 1955.