Cita APA (7th ed.)

O'Sullivan, A., & Sheffrin, S. M. (2001). Economics: Principles and tools (2nd ed.). Prentice Hall.

Cita Chicago (17th ed.)

O'Sullivan, Arthur, i Steven M. Sheffrin. Economics: Principles and Tools. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 2001.

Cita MLA (9th ed.)

O'Sullivan, Arthur, i Steven M. Sheffrin. Economics: Principles and Tools. 2nd ed. Prentice Hall, 2001.