Cita APA (7th ed.)

Samuelson, P. A., & Nordhaus, W. D. C. (2021). Economics (20th.). McGraw Hill Education.

Cita Chicago (17th ed.)

Samuelson, Paul A., i William D; Chaudhuri Nordhaus. Economics. 20th. New Delhi: McGraw Hill Education, 2021.

Cita MLA (9th ed.)

Samuelson, Paul A., i William D; Chaudhuri Nordhaus. Economics. 20th. McGraw Hill Education, 2021.