APA
United States. Environmetal Protection Agency, . (1992). Water quality. Washington: Environmental Protection Agency (EPA).
Chicago
United States. Environmetal Protection Agency, . 1992. Water quality. Washington: Environmental Protection Agency (EPA).
Harvard
United States. Environmetal Protection Agency, . (1992). Water quality. Washington: Environmental Protection Agency (EPA).
MLA
United States. Environmetal Protection Agency, . Water quality. Washington: Environmental Protection Agency (EPA). 1992.