| http://www.amca.org | Air Movement & Control Association International,Inc (AMCA) |
| http://www.ashrae.org | ASHRAE |
| http://asa.aip.org | Acoustical Society of America (ASA) |
| http://www.inceusa.org | Institute of Noise Control Engineering of the USA (INCE) |
| http://www.astm.org | ASTM International Standards |
| http://www.nist.gov/nvlap | NVLAP Website |
| http://www.adobe.com/products/acrobat/readstep2.html | Adobe Reader |
