Gwartney, J. D. (1980). Economics (Second Edition). ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Gwartney, James D. Economics (Second Edition). ELSEVIER, 1980.
Lua MLA (8ú heag.)Gwartney, James D. Economics (Second Edition). ELSEVIER, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.