References
- American Society for Testing and Materials . 1991 . Biological Contaminants in Indoor Environments Edited by: Morey , P. R. , Feeley , J. C. Sr. and Otten , J. A. Philadelphia ASTM STP 1071
- American Society for Testing and Materials . 1987 . “ Sampling Airborne Microorganisms at Municipal Solid-waste Processing Facilities. E 88482 ” . In Standards on Material and Environmental Microbiology Philadelphia ASTM PCN:03-535087-48
- American Conference of Governmental Industrial Hygienists . Guidelines for the Assessment of Bioaerosols in the Indoor Environment . ACGIH . Cincinnati, OH