Dyfyniad APA

American National Standards Institute. (1988). Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society.

Dyfyniad Arddull Chicago

American National Standards Institute. Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society, 1988.

Dyfyniad MLA

American National Standards Institute. Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society, 1988.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.