1. WHO/UNICEF, Drinking Water, Sanitation and Hygiene in Schools - Global baseline report 2018, 2018.
2. WHO, WHO water, sanitation and hygiene strategy 2018–2025, 2018.
3. WHO, Results of round II of the WHO international scheme to evaluate household water treatment technologies, 2019.
4. WHO/UNICEF, Progress on drinking water, sanitation and hygiene: 2017 update and SDG baselines, 2017.
5. J.C. Crittenden, R.R. Trussell, D.W. Hand, K.J. Howe, G. Tchobanoglous, MWHas Water Treatment, 2012.