APA (7th ed.) Zitazioa

(2007). Organically produced foods (third edition.).

Chicago Style (17th ed.) Zitazioa

Organically Produced Foods. third edition. 2007.

MLA (9th ed.) Zitazioa

Organically Produced Foods. third edition. 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.