Water Pollution Control - A Guide to the Use of Water Quality Management Principles
Water Pollution Control - A Guide to the Use of Water Quality Management Principles -
Edited by - Richard Helmer and Ivanildo Hespanhol
Published on behalf of
UNEP- United Nations Environment Programme
Water Supply & Sanitation Collaborative Council
World Health Organization
http://www.who.int/water_sanitation_health/resourcesquality/watpolcontrol.pdf