ISO & International Organization for Standardization. (2012). International Standard ISO 9712: Non-destructive testing. Qualification and certification of NDT personnel (4a. ed.). International Organization for Standardization.
Chicago-viite (17. p.)ISO ja International Organization for Standardization. International Standard ISO 9712: Non-destructive Testing. Qualification and Certification of NDT Personnel. 4a. ed. Ginebra: International Organization for Standardization, 2012.
MLA-viite (9. p.)ISO ja International Organization for Standardization. International Standard ISO 9712: Non-destructive Testing. Qualification and Certification of NDT Personnel. 4a. ed. International Organization for Standardization, 2012.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.