APA (7th ed.) Citation

(1981). Specification for qualification of welding procedures and welders for piping and tubing (Superseding AWS D10.9-69.). American Welding Society.

Chicago Style (17th ed.) Citation

Specification for Qualification of Welding Procedures and Welders for Piping and Tubing. Superseding AWS D10.9-69. Miami <Fla.>: American Welding Society, 1981.

MLA (9th ed.) Citation

Specification for Qualification of Welding Procedures and Welders for Piping and Tubing. Superseding AWS D10.9-69. American Welding Society, 1981.