Dyfyniad APA

Samuelson, P. A., & Nordhaus, W. D. (2018). Economics (19th.). McGraw Hill Education India) Private Limited.

Dyfyniad Arddull Chicago

Samuelson, Paul A., and William D. Nordhaus. Economics. 19th. New Delhi: McGraw Hill Education India) Private Limited, 2018.

Dyfyniad MLA

Samuelson, Paul A., and William D. Nordhaus. Economics. 19th. McGraw Hill Education India) Private Limited, 2018.

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