Dyfyniad APA

Samuelson,Paul A, & Nordhaus, W. D. (2020). Economics (20th Edition.). Tata McGraw Hill.

Dyfyniad Arddull Chicago

Samuelson,Paul A, and William D. Nordhaus. Economics. 20th Edition. Chennai: Tata McGraw Hill, 2020.

Dyfyniad MLA

Samuelson,Paul A, and William D. Nordhaus. Economics. 20th Edition. Tata McGraw Hill, 2020.

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