Case, K. E., Fair, R. C., & Oster, S. E. (2018). Principles of Economics (12th ed.). Pearson education India Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Case, Karl E., Ray C. Fair, agus Sharon E. Oster. Principles of Economics. 12th ed. New Delhi: Pearson education India Pvt. Ltd, 2018.
Lua MLA (9ú heag.)Case, Karl E., et al. Principles of Economics. 12th ed. Pearson education India Pvt. Ltd, 2018.
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