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^ Sullivan, Arthur ; Steven M. Sheffrin (2003). Economics: Principles in action . Upper Saddle River, New Jersey 07458: Prentice Hall. pp. 502. ISBN 0-13-063085-3 . https://www.savvas.com/index.cfm?locator=PSZu4y&PMDbSiteId=2781&PMDbSolutionId=6724&PMDbSubSolutionId=&PMDbCategoryId=815&PMDbSubCategoryId=24843&PMDbSubjectAreaId=&PMDbProgramId=23061 . Archived ????? 20, 2016 at the Wayback Machine " Archive copy ". Archived from the original on 2016-12-20. ?2021-02-24 ?????.

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[1] Sullivan, Arthur ; Steven M. Sheffrin (2003). Economics: Principles in action . Upper Saddle River, New Jersey 07458: Prentice Hall. pp. 502. ISBN 0-13-063085-3 . https://www.savvas.com/index.cfm?locator=PSZu4y&PMDbSiteId=2781&PMDbSolutionId=6724&PMDbSubSolutionId=&PMDbCategoryId=815&PMDbSubCategoryId=24843&PMDbSubjectAreaId=&PMDbProgramId=23061 . Archived ????? 20, 2016 at the Wayback Machine " Archive copy ". Archived from the original on 2016-12-20. ?2021-02-24 ?????.

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