Samuelson, P. A., & Nordhaus, W. D. (1989). Macroeconomics: A version of economics (13th ed.). McGraw-Hill.
Dyfyniad Arddull ChicagoSamuelson, Paul A., and William D. Nordhaus. Macroeconomics: A Version of Economics. 13th ed. New York: McGraw-Hill, 1989.
Dyfyniad MLASamuelson, Paul A., and William D. Nordhaus. Macroeconomics: A Version of Economics. 13th ed. McGraw-Hill, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.