1. 1. Robbins, L. A (1998). History of Economic Thought. The LSE Lectures. Princeton University Press. Retrieved from https://coollib.net/b/442612-layonel-robbins-istoriya-ekonomicheskoy-myisli/read#t6.
2. 2. Ricardo, D. (1951). On the Principles of Political Economy and Taxation. (3rd Ed.). In Sraffa, P., & Dobb, M. H. 1821 from The Works and Correspondence of David Ricardo. Cambridge: Cambridge University Press. Retrieved from https://www.econlib.org/library/Ricardo/ricP.html.
3. 3. Marx, K. (1989). Theories of Surplus Value. In Contained in the Collected Works of Karl Marx and Frederick Engels, vol. 32. New York: International Publishers.
4. 4. Stamp, J. C. (1927). Industrial Fluctuations. By Arthur Cecil Pigou, рrofessor of Political Economy in the University of Cambridge. (Macmillan & Co. Ltd. 1927. 397 p.). The Economic Journal, 37 (147), 418-424. DOI: 10.2307/2223555.
5. 5. Kuznets, S. S. (1955). Economic Growth and Income Inequalit. The American economic Review, XLV (1). Retrieved from https://assets.aeaweb.org/asset-server/files/9438.pdf.