APA (7th ed.) Zitazioa
Gardner, H. S. (1998). Comparative economic systems. Dryden press.
Chicago Style (17th ed.) Zitazioa
Gardner, H. Stephen. Comparative Economic Systems. Chicago: Dryden press, 1998.
MLA (9th ed.) Zitazioa
Gardner, H. Stephen. Comparative Economic Systems. Dryden press, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.