Cita APA (7th ed.)
Samuelson, P. A., & Nordhaus, W. D. (2010). Economics (19th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 19th ed. New York: McGraw-Hill, 2010.
Cita MLA (9th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 19th ed. McGraw-Hill, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.