Reference
- 1966 . Threshold Limits Committee: Documentation of Threshold Limit Values, Revised Edition. , Ohio : American Conference of Governmental Industrial Hygienists . 1014 Broadway, Cincinnati
- 1963 . Division of Air Pollution: Procedures for the Analysis of Suspended Particulate Matter Collected on Glass Fiber Filters. , Washington, D. C. : United States Public Health Service, Division of Air Pollution .