National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
Citazione stile Chigago Style (17a edizione)National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
Citatione MLA (9a ed.)National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.