1. American Water Works Assn. AWWA Standard for Disinfecting Water Mains, AWWA C601-68
2. “Mains Disinfection Methods and Objectives. Part I, Use of Liquid Chlorine,”;Seeker;JAWWA,1969
3. Russelman , H.B. “Main Disinfection Methods and Objectives, Part III, Public Health Viewpoint,” JAWWA 1969
4. Suckling , E.V. The Examination of Waters and Water Supplies 5th edition 1943 658 659