World Health Organization. Guidelines for drinking-water quality.
Chicago-čujuhus (17. p.)World Health Organization. Guidelines for Drinking-water Quality.
MLA-čujuhus (9. p.)World Health Organization. Guidelines for Drinking-water Quality.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.