ASFAHL, C. (1995). Industrial Safety And Health Management C. Ray Asfahl. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)ASFAHL, C.RAY. Industrial Safety And Health Management C. Ray Asfahl. Prentice-Hall, 1995.
Lua MLA (8ú heag.)ASFAHL, C.RAY. Industrial Safety And Health Management C. Ray Asfahl. Prentice-Hall, 1995.
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