National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
芝加哥风格引文National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
MLA引文National Service Center for Environmental Publications NSCEP / U.S. Environmental Protection Agency EPA. Onsite Wastewater Treatment Systems Manual.
警告：这些引文格式不一定是100％准确.