1. The U.S. Census Bureau (2010). People Data. Available at http://www.census.gov/people/
2. American Time Use Survey (2014) The U.S. department of labor
3. United State Environmental Protection Agency (2004a) Response protocol toolbox: Planning for and responding to drinking water contamination threats and incidents — module 1: Water utility planning guide. EPA report, pages EPA report 817–03–005. Environmental Protection Agency, Washington, D.C.
4. United State Environmental Protection Agency (2004b) Response protocol toolbox: Planning for and responding to drinking water contamination threats and incidents — module 2: Threat management guide. EPA report, pages EPA report 817–03–005. Environmental Protection Agency, Washington, D.C.
5. United State Environmental Protection Agency (2004c) Response protocol toolbox: Planning for and responding to drinking water contamination threats and incidents — module 3: Site characterization and sampling guide. EPA report, pages EPA report 817–03–005. Environmental Protection Agency, Washington, D.C.