APA (7th ed.) Zitazioa
Arnold, R. A. (2001). Economics (6th ed.). South-Western College Pub..
Chicago Style (17th ed.) Zitazioa
Arnold, Roger A. Economics. 6th ed. Cincinnati, Ohio: South-Western College Pub., 2001.
MLA (9th ed.) Zitazioa
Arnold, Roger A. Economics. 6th ed. South-Western College Pub., 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.