Malaysia. Kementerian Sumber Manusia. Jabatan Keselamatan dan Kesihatan Pekerjaan. (2002). Guidelines on monitoring of airbone contaminant for chemical hazardous to health: Under the occupational safety and health (use and standard of exposure of chemicals hazardous to health) regualtions, 2000, P.U (A) 131. National Institute of Occupational Safety and Health.
Cita Chicago (17th ed.)Malaysia. Kementerian Sumber Manusia. Jabatan Keselamatan dan Kesihatan Pekerjaan. Guidelines on Monitoring of Airbone Contaminant for Chemical Hazardous to Health: Under the Occupational Safety and Health (use and Standard of Exposure of Chemicals Hazardous to Health) Regualtions, 2000, P.U (A) 131. Bandar Baru Bangi: National Institute of Occupational Safety and Health, 2002.
Cita MLA (8th ed.)Malaysia. Kementerian Sumber Manusia. Jabatan Keselamatan dan Kesihatan Pekerjaan. Guidelines on Monitoring of Airbone Contaminant for Chemical Hazardous to Health: Under the Occupational Safety and Health (use and Standard of Exposure of Chemicals Hazardous to Health) Regualtions, 2000, P.U (A) 131. National Institute of Occupational Safety and Health, 2002.