APA (7th ed.) Zitazioa
Krugman, P. R., & Obstfeld, M. (1994). International economics: Theory and policy (3rd.ed.). Harper Collins.
Chicago Style (17th ed.) Zitazioa
Krugman, Paul R., eta Maurice Obstfeld. International Economics: Theory and Policy. 3rd.ed. Harper: Harper Collins, 1994.
MLA (9th ed.) Zitazioa
Krugman, Paul R., eta Maurice Obstfeld. International Economics: Theory and Policy. 3rd.ed. Harper Collins, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.