Dyfyniad APA

Samuelson, P. A., & Samuelson, W. (2001). Economics (17th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Samuelson, Paul A., and William Samuelson. Economics. 17th ed. New York: McGraw-Hill, 2001.

Dyfyniad MLA

Samuelson, Paul A., and William Samuelson. Economics. 17th ed. McGraw-Hill, 2001.

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