Cita APA (7th ed.)

Samuelson, P. A. (2005). Economics (7th omson.). Thomson.

Cita Chicago (17th ed.)

Samuelson, Paul A. Economics. 7th omson. South- Western/Th Learning: Thomson, 2005.

Cita MLA (9th ed.)

Samuelson, Paul A. Economics. 7th omson. Thomson, 2005.