APA (7th ed.) Zitazioa
Puth, R. C. (1988). American economic history (2nd ed.). Dryden Press.
Chicago Style (17th ed.) Zitazioa
Puth, Robert Christian. American Economic History. 2nd ed. Chicago: Dryden Press, 1988.
MLA (9th ed.) Zitazioa
Puth, Robert Christian. American Economic History. 2nd ed. Dryden Press, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.