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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रISO और 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.
एमएलए (9वां संस्करण) प्रशस्ति पत्रISO और International Organization for Standardization. International Standard ISO 9712: Non-destructive Testing. Qualification and Certification of NDT Personnel. 4a. ed. International Organization for Standardization, 2012.
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