Parkin, M. (2000). Economics (5th ed.). Addison-Wesley Pub. Co..
Lua i Stíl Chicago (17ú heag.)Parkin, Michael. Economics. 5th ed. Reading, Mass.: Addison-Wesley Pub. Co., 2000.
Lua MLA (8ú heag.)Parkin, Michael. Economics. 5th ed. Addison-Wesley Pub. Co., 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.