Dyfyniad APA

Wonnacott, P., & Wonnacott, R. J. (1990). Economics (4th.ed.). John Wiley & sons.

Dyfyniad Arddull Chicago

Wonnacott, Paul, and Ronald J. Wonnacott. Economics. 4th.ed. New York: John Wiley & sons, 1990.

Dyfyniad MLA

Wonnacott, Paul, and Ronald J. Wonnacott. Economics. 4th.ed. John Wiley & sons, 1990.

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