Dyfyniad APA

Case, K. E., & Fair, R. C. (2004). Principles of economics (7th ed.). Pearson/Prentice Hall.

Dyfyniad Arddull Chicago

Case, Karl E., and Ray C. Fair. Principles of Economics. 7th ed. Upper Saddle River, NJ: Pearson/Prentice Hall, 2004.

Dyfyniad MLA

Case, Karl E., and Ray C. Fair. Principles of Economics. 7th ed. Pearson/Prentice Hall, 2004.

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