Gwartney, J. D. (1985). Essentials of Economics (Second Edition). ELSEVIER.
Cita Chicago (17th ed.)Gwartney, James D. Essentials of Economics (Second Edition). ELSEVIER, 1985.
Cita MLA (8th ed.)Gwartney, James D. Essentials of Economics (Second Edition). ELSEVIER, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.