Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
Chicago-čujuhus (17. p.)Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
MLA-čujuhus (9. p.)Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.