Citazione APA

Samuelson, P. A., & Nordhaus, W. D. (2010). Economics (19th ed.). McGraw-Hill Irwin.

Stile di citazione Chicago

Samuelson, Paul A., e William D. Nordhaus. Economics. 19th ed. New Delhi: McGraw-Hill Irwin, 2010.

Citazione MLA

Samuelson, Paul A., e William D. Nordhaus. Economics. 19th ed. McGraw-Hill Irwin, 2010.