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Carefoot, Neil ,  Gibson, Howard ,  World Health Organization. Community Water Supply and Sanitation Unit ,  International Drinking Water Supply and Sanitation Decade ,  [Human resources development handbook : guidelines for ministries & agencies responsible for water supply & sanitation / edited by Neil Carefoot & Howard Gibson]

Carefoot, Neil ,  Gibson, Howard ,  World Health Organization. Community Water Supply and Sanitation Unit ,  International Drinking Water Supply and Sanitation Decade ,  [Human resources development handbook : guidelines for ministries & agencies responsible for water supply & sanitation / edited by Neil Carefoot & Howard Gibson]