Lovejoy, D. (1991). Penetrant testing: A practical guide. Chapman & Hall.
Lua i Stíl Chicago (17ú heag.)Lovejoy, David. Penetrant Testing: A Practical Guide. London: Chapman & Hall, 1991.
Lua MLA (9ú heag.)Lovejoy, David. Penetrant Testing: A Practical Guide. Chapman & Hall, 1991.
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