APA (7th ed.) Zitazioa

Arnold, R. A. (2020). Economics (13th ed.). Cengage Learning.

Chicago Style (17th ed.) Zitazioa

Arnold, Roger A. Economics. 13th ed. Boston, MA: Cengage Learning, 2020.

MLA (9th ed.) Zitazioa

Arnold, Roger A. Economics. 13th ed. Cengage Learning, 2020.