O'Sullivan, A., & Sheffrin, S. M. (2006). Economics: Principles and tools (4th ed.). Pearson/ Prentice Hall.
Lua i Stíl Chicago (17ú heag.)O'Sullivan, Arthur, agus Steven M. Sheffrin. Economics: Principles and Tools. 4th ed. Upper Saddle River, N.J: Pearson/ Prentice Hall, 2006.
Lua MLA (9ú heag.)O'Sullivan, Arthur, agus Steven M. Sheffrin. Economics: Principles and Tools. 4th ed. Pearson/ Prentice Hall, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.