Gwartney, J. D. (1985). Essentials of Economics (Second Edition). ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Gwartney, James D. Essentials of Economics (Second Edition). ELSEVIER, 1985.
Lua MLA (8ú heag.)Gwartney, James D. Essentials of Economics (Second Edition). ELSEVIER, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.