APA (7th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Ropa con ajuste perfecto. Limusa.
Chicago Style (17th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Ropa Con Ajuste Perfecto. México: Limusa.
MLA (9th ed.) Zitazioa
Singer Sewing Machine Company. Education Department. Ropa Con Ajuste Perfecto. Limusa.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.