Cita APA (7a ed.)

Samuelson, P. A. (2011). Economics (19th.). Mcgraw hill.

Cita Chicago Style (17a ed.)

Samuelson, Paul A. Economics. 19th. New Delhi: Mcgraw hill, 2011.

Cita MLA (9a ed.)

Samuelson, Paul A. Economics. 19th. Mcgraw hill, 2011.