Não informado. (2018). Monthly Review. Department of Labor, Division of Industrial Hygiene.
Lua i Stíl Chicago (17ú heag.)Não informado. Monthly Review. Albany, NY: Department of Labor, Division of Industrial Hygiene, 2018.
Lua MLA (8ú heag.)Não informado. Monthly Review. Department of Labor, Division of Industrial Hygiene, 2018.
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