Dyfyniad APA

Parkin, M., Powell, M., & Matthews, K. (2012). Economics (8th ed.). Addison-Wesley ; Pearson.

Dyfyniad Arddull Chicago

Parkin, Michael, Melanie Powell, and Kent Matthews. Economics. 8th ed. Harlow, England ; Boston, MA: Addison-Wesley ; Pearson, 2012.

Dyfyniad MLA

Parkin, Michael, et al. Economics. 8th ed. Addison-Wesley ; Pearson, 2012.

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