Dyfyniad APA

Lipsey, R. G., & Courant, P. N. (1995). Economics (11th ed.). HarperCollins.

Dyfyniad Arddull Chicago

Lipsey, Richard G., and Paul N. Courant. Economics. 11th ed. New York: HarperCollins, 1995.

Dyfyniad MLA

Lipsey, Richard G., and Paul N. Courant. Economics. 11th ed. HarperCollins, 1995.

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