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↑ Sullivan, Arthur ; Steven M. Sheffrin (2003). Economics: Principles in action . Upper Saddle River, New Jersey 07458: Pearson Prentice Hall. p. 29. ISBN 0-13-063085-3 . {{ cite book }}: CS1 maint: location ( link )

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[1] Sullivan, Arthur ; Steven M. Sheffrin (2003). Economics: Principles in action . Upper Saddle River, New Jersey 07458: Pearson Prentice Hall. p. 29. ISBN 0-13-063085-3 . {{ cite book }}: CS1 maint: location ( link )

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