APA (7th ed.) Zitazioa
Byrns, R. (1995). Economics (6th ed.). Scott,Foresman.
Chicago Style (17th ed.) Zitazioa
Byrns, Ralph. Economics. 6th ed. Illinois: Scott,Foresman, 1995.
MLA (9th ed.) Zitazioa
Byrns, Ralph. Economics. 6th ed. Scott,Foresman, 1995.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.