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Barro, Robert J.. (1987). Macroeconomics . New York: John Wiley & Sons.

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Barro, Robert J.. Macroeconomics. New York: John Wiley & Sons, 1987. Text.

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Barro, Robert J.. Macroeconomics. New York: John Wiley & Sons, 1987. Text.

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Barro, Robert J.. Macroeconomics. New York: John Wiley & Sons, 1987. Print.