Philippines. Bureau of Working Conditions. Occupational Safety and Health Division. (1990). Primer on the occupational safety and health standards: As amended. Health and Safety, Occupational Safety and Health Division, Bureau of Working Conditions, Dept. of Labor and Employment.
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Citace podle MLA (9th ed.)Philippines. Bureau of Working Conditions. Occupational Safety and Health Division. Primer on the Occupational Safety and Health Standards: As Amended. Health and Safety, Occupational Safety and Health Division, Bureau of Working Conditions, Dept. of Labor and Employment, 1990.