APA

United States, . (2009). EPA protocol for the second review of existing national primary drinking water regulations (updated). [Washington, D.C.]: United States Environmental Protection Agency, Office of Water.

Chicago

United States, . 2009. EPA protocol for the second review of existing national primary drinking water regulations (updated). [Washington, D.C.]: United States Environmental Protection Agency, Office of Water.

Harvard

United States, . (2009). EPA protocol for the second review of existing national primary drinking water regulations (updated). [Washington, D.C.]: United States Environmental Protection Agency, Office of Water.

MLA

United States, . EPA protocol for the second review of existing national primary drinking water regulations (updated). [Washington, D.C.]: United States Environmental Protection Agency, Office of Water. 2009.