Gaya APA

Case, K, E. et al (2014). Principles of Macroeconomics 11th Ed (11th Ed). United Stated of America: Pearson Eduation.

Gaya MLA

Case, Karl, E. et al. "Principles of Macroeconomics 11th Ed". 11th Ed United Stated of America: Pearson Eduation, 2014. Text.