Dyfyniad APA
Samuelson, P. A., & Nordhaus, W. D. (2012). Economics (19 th ed.). Tata Mcgraw Hill Education.
Dyfyniad Arddull Chicago
Samuelson, Paul A., and William D. Nordhaus. Economics. 19 th ed. New Delhi: Tata Mcgraw Hill Education, 2012.
Dyfyniad MLA
Samuelson, Paul A., and William D. Nordhaus. Economics. 19 th ed. Tata Mcgraw Hill Education, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.