Dyfyniad APA

Krugman, P. R., & Obstfeld, M. (2009). International economics: Theory and policy (Eighth edition.). Pearson Addison-Wesley.

Dyfyniad Arddull Chicago

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. Eighth edition. Boston: Pearson Addison-Wesley, 2009.

Dyfyniad MLA

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. Eighth edition. Pearson Addison-Wesley, 2009.

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