1. The United Nations World Water Development Report 3
2. World Water Day: A global awareness campaign to tackle the water crisis
3. Global Public Water Education: The World Water Monitoring Day Experience
4. Cornell Laboratory of Ornithology.http://www.birds.cornell.edu/(accessed 18 September 2018).
5. Open Air Laboratories (OPAL).https://www.opalexplorenature.org/(accessed 18 September2018).