American National Standards Institute. (1989). Standard for Accrediation of Test Facilities for AWS Certified Welder Program - AWS QC 4-89. American: American Welding Society.
Chicago Stili AlıntıAmerican National Standards Institute. Standard for Accrediation of Test Facilities for AWS Certified Welder Program - AWS QC 4-89. American: American Welding Society, 1989.
MLA AlıntıAmerican National Standards Institute. Standard for Accrediation of Test Facilities for AWS Certified Welder Program - AWS QC 4-89. American: American Welding Society, 1989.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..