World Health Organization. (2012). Water safety planning for small community water supplies: Step-by-step risk management guidance for drinking water supplies in small communities. World Health Organization.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)World Health Organization. Water Safety Planning for Small Community Water Supplies: Step-by-step Risk Management Guidance for Drinking Water Supplies in Small Communities. Geneva, Switzerland: World Health Organization, 2012.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)World Health Organization. Water Safety Planning for Small Community Water Supplies: Step-by-step Risk Management Guidance for Drinking Water Supplies in Small Communities. World Health Organization, 2012.
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