1. Presidential Decree 442 of 1974, Labor Code of the Philippines. http://www.dole.gov.ph/labor_codes.php.
2. Occupational Safety and Health Standards, Department of Labor and Employment, Republic of the Philippines. http://www.dole.gov.ph.
3. Occupational Safety and Health Center, Department of Labor and Employment, Republic of the Philippines. http://www.oshc.dole.gov.ph/.
4. Promoting Chemical Laboratory Safety and Security in Developing Countries, Committee on Promoting Safe and Secure Chemical Management in Developing Countries, National Research Council of the National Academies, The National Academic Press, Washington, DC, 2010.