1. U.S. EPA. Exposure Factors Handbook 2011 Edition (Final);USEPA,2011
2. Technical Information about Beaches;USEPA,2016
3. Recreational Water Illnesses;CDC,2016
4. NSPF, Certified Pool-SPA Operator, Kowalsky, L. Ed., National Swimming Pool Foundation, San Antonio, TX, 1992, p. 46.
5. The Model Aquatic Health Code (MAHC): an All-inclusive Model Public Swimming Pool and Spa Code;CDC,2014