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Baris 13: \| title = Economics: Principles in action \| publisher = ~~Pearson~~ Prentice Hall \| year = 2003 Baris 21: \| pages = 197, 507 \| url = ~~http~~https://www.~~pearsonschool~~savvas.com/index.cfm?locator=~~PSZ3R9~~PSZu4y&PMDbSiteId=2781&PMDbSolutionId=6724&PMDbSubSolutionId=&PMDbCategoryId=815&~~PMDbProgramId~~PMDbSubCategoryId=~~12881~~24843&~~level~~PMDbSubjectAreaId=&PMDbProgramId=423061 \| doi =

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