Washington State Department of Health. Slow sand filtration and diatomaceous earth filtration for small water systems.
Chicago Style (17th ed.) CitationWashington State Department of Health. Slow Sand Filtration and Diatomaceous Earth Filtration for Small Water Systems.
MLA (9th ed.) CitationWashington State Department of Health. Slow Sand Filtration and Diatomaceous Earth Filtration for Small Water Systems.
Warning: These citations may not always be 100% accurate.