Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.