1. WHO and UNICEF Joint Water Supply, Sanitation Monitoring Programme, and World Health Organization. Progress on drinking water and sanitation: 2014 Update. WHO: World Health Organization; 2015.
2. Onda K, LoBuglio J, Bartram J. Global access to safe water: accounting for water quality and the resulting impact on MDG progress. Intl J En H Pub Rese. 2012;9:880–94.
3. Morella E, Foster V, Banerjee SG. Climbing the ladder: the state of sanitation in sub-Saharan Africa. Background Paper. 2008;13.
4. Buckley CA, Foxon KM, Brouckaert CJ, Rodda N, Nwaneri C, Balboni E, Magagna D. Scientific support for design and operation of ventilated pit latrines and the efficacy of pit latrine additives. Rep Water Res Comm. 2008:3–12.
5. Bartram J, Cairncross S. Hygiene, sanitation, and water: forgotten foundations of health. PLoS Med. 2010;7(11):e1000367.