Cita APA (7th ed.)
Samuelson, P. A., & Nordhaus, W. D. (1985). Economics (12th ed.). McGraw-Hill Book.
Cita Chicago (17th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 12th ed. New York: McGraw-Hill Book, 1985.
Cita MLA (9th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 12th ed. McGraw-Hill Book, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.