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Salvatore, D., & Diulio, E. A. (1996). Schaum's outline of theory and problems of principles of economics (2nd ed.). New Delhi: McGraw-Hill.

Salvatore, Dominick, and Eugene A. Diulio. Schaum's Outline of Theory and Problems of Principles of Economics. 2nd ed. New Delhi: McGraw-Hill, 1996.

Salvatore, Dominick, and Eugene A. Diulio. Schaum's Outline of Theory and Problems of Principles of Economics. 2nd ed. New Delhi: McGraw-Hill, 1996.