Dyfyniad APA

Samuelson, P. A., & Nordhaus, W. D. C. (2021). Economics (20th.). McGraw Hill Education.

Dyfyniad Arddull Chicago

Samuelson, Paul A., and William D; Chaudhuri Nordhaus. Economics. 20th. New Delhi: McGraw Hill Education, 2021.

Dyfyniad MLA

Samuelson, Paul A., and William D; Chaudhuri Nordhaus. Economics. 20th. McGraw Hill Education, 2021.

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