Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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

Atenció: Aquestes cites poden no estar 100% correctes.