Drinking Water and Health, Volume 2 - A 1980 National Research Council report discussing problems with the disinfection of water for drinking. Chlorination can result in the formation of trihalomethanes (THM's) and other halogenated hydrocarbons. - http://www.nap.edu/books/0309029317/html/index.html
Chlorine Issues - C3.org - Information on chlorine-related issues and its use as a disinfectant in water and elsewhere. - http://c3.org/chlorine_issues/disinfection/disinfection_index.html