APA (7th ed.) Zitazioa

(1974). Helical springs / prepared by the Spring Research Association.

Chicago Style (17th ed.) Zitazioa

Helical Springs / Prepared by the Spring Research Association. 1974.

MLA (9th ed.) Zitazioa

Helical Springs / Prepared by the Spring Research Association. 1974.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.