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Dernburg, T. F., & McDougall, D. M. (1968). Macroeconomics: The measurement, analysis and control of aggregate economic activity (3rd ed.). New York: McGraw Hill Book.

Dernburg, Thomas F., and Ducan. M. McDougall. Macroeconomics: The Measurement, Analysis and Control of Aggregate Economic Activity. 3rd ed. New York: McGraw Hill Book, 1968.

Dernburg, Thomas F., and Ducan. M. McDougall. Macroeconomics: The Measurement, Analysis and Control of Aggregate Economic Activity. 3rd ed. New York: McGraw Hill Book, 1968.