American National Standards Institute. (1988). Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society.
Citação norma ChicagoAmerican National Standards Institute. Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society, 1988.
Citação norma MLAAmerican National Standards Institute. Recommended Practices and Procedures for Welding Low Carbon Steel Pipe - ANSI/AWS D10.12-89. American: American Welding Society, 1988.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.