APA (7th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Confección en telas especiales. Limusa.
Chicago Style (17th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Confección En Telas Especiales. México: Limusa.
MLA (9th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Confección En Telas Especiales. Limusa.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.