Povezave
[1] http://www.who.int/water_sanitation_health/dwq/secondaddendum20081119.pdf
[2] http://wwwnc.cdc.gov/travel/yellowbook/2014/chapter-2-the-pre-travel-consultation/water-disinfection-for-travelers
[3] https://nijz.si/sites/www.nijz.si/files/datoteke/505_0.pdf