Gravelle,Hugh. (2008). Microeconomics (3.). Pearson.
Lua i Stíl Chicago (17ú heag.)Gravelle,Hugh. Microeconomics. 3. Noida: Pearson, 2008.
Lua MLA (9ú heag.)Gravelle,Hugh. Microeconomics. 3. Pearson, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.