Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
Čikaški stil citiranja (17. izdanje)Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
MLA način citiranja (9. izdanje)Certifications Documents / American Welding Society. Specification for the Qualification of Welding Engineers.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.