Cita APA (7th ed.)
Samuelson, P. A., & Nordhaus, W. D. (2006). Economics (18th ed. ( International ed.).). McGraw-Hill/Irwin.
Cita Chicago (17th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 18th ed. ( International ed.). Boston: McGraw-Hill/Irwin, 2006.
Cita MLA (9th ed.)
Samuelson, Paul A., i William D. Nordhaus. Economics. 18th ed. ( International ed.). McGraw-Hill/Irwin, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.