APA (7th ed.) Citation

Samuelson, P. A., & Nordhaus, W. D. (1989). Economics. McGraw-Hill.

Chicago Style (17th ed.) Citation

Samuelson, Paul A., and William D. Nordhaus. Economics. New York: McGraw-Hill, 1989.

MLA (9th ed.) Citation

Samuelson, Paul A., and William D. Nordhaus. Economics. McGraw-Hill, 1989.