Não informado. (1973). Job safety and health. Occupational Safety and Health Administration.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Job Safety and Health. Washington: Occupational Safety and Health Administration, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Job Safety and Health. Occupational Safety and Health Administration, 1973.
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