Dyfyniad APA

Krugman, P. R., & Obstfeld, M. (1991). International economics: Theory and policy (2nd ed.). Harper Collins.

Dyfyniad Arddull Chicago

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: Harper Collins, 1991.

Dyfyniad MLA

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. Harper Collins, 1991.

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