Case Karl E. (2018). Principles of Economics (12th.). Pearson.
Cita Chicago (17th ed.)Case Karl E. Principles of Economics. 12th. Pearson, 2018.
Cita MLA (9th ed.)Case Karl E. Principles of Economics. 12th. Pearson, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.