Não informado. (1973). Job safety and health. Occupational Safety and Health Administration.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Job Safety and Health. Washington: Occupational Safety and Health Administration, 1973.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Job Safety and Health. Occupational Safety and Health Administration, 1973.
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