Dyfyniad APA

Samuelson, P., & Nordhaus, W. (1998). Economics/16e (16th ed.). Tata McGraw Hill.

Dyfyniad Arddull Chicago

Samuelson, Paul.A, and William.D Nordhaus. Economics/16e. 16th ed. New Delhi: Tata McGraw Hill, 1998.

Dyfyniad MLA

Samuelson, Paul.A, and William.D Nordhaus. Economics/16e. 16th ed. Tata McGraw Hill, 1998.

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