(2020). Economics (20th ed.). McGrae Hill Education.
Chicago Style (17th ed.) ZitazioaEconomics. 20th ed. New York: McGrae Hill Education, 2020.
MLA (9th ed.) ZitazioaEconomics. 20th ed. McGrae Hill Education, 2020.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.