1. Ammonia sensors and their applications–A review;Timmer;Sen. Actuators B Chem.,2005
2. Ammonia (NH3) CAS 7664–7 UN 2672 (Between 12% and 44% solution), UN 2073 (>44% solution), UN 1005 (anhydrous gas or >50% solution)http://www.atsdr.cdc.gov/MHMI/mmg126.pdf
3. Toxicological Profile for Ammoniahttp://www.atsdr.cdc.gov/toxprofiles/tp126.pdf
4. Public Health Statement. Ammoniahttp://www.atsdr.cdc.gov/ToxProfiles/tp126-c1-b.pdf
5. International Programme on Chemical Safety. Environmental Health Criteria 54. Ammoniahttp://www.inchem.org/documents/ehc/ehc/ehc54.htm