APA (7th ed.) Zitazioa

Karl Marx (Great Neck Publishing). Great Neck Publishing.

Chicago Style (17th ed.) Zitazioa

Karl Marx (Great Neck Publishing). Great Neck Publishing.

MLA (9th ed.) Zitazioa

Karl Marx (Great Neck Publishing). Great Neck Publishing.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.