APA

United States, . (2009). Occurrence analysis for potential source waters for the second six-year review of national primary drinking water regulations. [Washington, D.C.]: U.S. Environmental Protection Agency, Office of Water.

Chicago

United States, . 2009. Occurrence analysis for potential source waters for the second six-year review of national primary drinking water regulations. [Washington, D.C.]: U.S. Environmental Protection Agency, Office of Water.

Harvard

United States, . (2009). Occurrence analysis for potential source waters for the second six-year review of national primary drinking water regulations. [Washington, D.C.]: U.S. Environmental Protection Agency, Office of Water.

MLA

United States, . Occurrence analysis for potential source waters for the second six-year review of national primary drinking water regulations. [Washington, D.C.]: U.S. Environmental Protection Agency, Office of Water. 2009.