Hill, R. C. (2008). Principles of economimics. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Hill, R. Carter. Principles of Economimics. John Wiley & Sons, 2008.
Lua MLA (8ú heag.)Hill, R. Carter. Principles of Economimics. John Wiley & Sons, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.