APA (7th ed.) Citation

SAMUELSON, P. A., & NORDHAUS, W. D. (1989). Macroeconomics: A version of economics.-- Ed.13. McGraw-Hill.

Chicago Style (17th ed.) Citation

SAMUELSON, Paul A., and William D. NORDHAUS. Macroeconomics: A Version of Economics.-- Ed.13. New York: McGraw-Hill, 1989.

MLA (9th ed.) Citation

SAMUELSON, Paul A., and William D. NORDHAUS. Macroeconomics: A Version of Economics.-- Ed.13. McGraw-Hill, 1989.