1. Centers for disease control and prevention.
http://www.cdc.gov/asthma
. Accessed June 2015
2. Icedot.
https://icedot.org/
. Accessed June 2015
3. Open layer.
http://openlayers.org/
. Accessed June 2015
4. Openweather map.
http://openweathermap.org/
. Accessed June 2015
5. Propeller health.
http://www.propellerhealth.com/
. Accessed June 2015