PETERSEN, D. (1971). Techniques Of Safety Management Daniel Petersen. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)PETERSEN, Daniel. Techniques Of Safety Management Daniel Petersen. McGraw-Hill, 1971.
Lua MLA (8ú heag.)PETERSEN, Daniel. Techniques Of Safety Management Daniel Petersen. McGraw-Hill, 1971.
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