Washington State Department of Health. Slow sand filtration and diatomaceous earth filtration for small water systems.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington State Department of Health. Slow Sand Filtration and Diatomaceous Earth Filtration for Small Water Systems.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWashington State Department of Health. Slow Sand Filtration and Diatomaceous Earth Filtration for Small Water Systems.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.