Canada. Environmental Protection Service. (1976). Guidelines for effluent quality and wastewater treatment at federal establishments. Federal Activities Environmental Branch, Environmental Conservation Directorate.
Dyfyniad Arddull ChicagoCanada. Environmental Protection Service. Guidelines for Effluent Quality and Wastewater Treatment at Federal Establishments. [Ottawa]: Federal Activities Environmental Branch, Environmental Conservation Directorate, 1976.
Dyfyniad MLACanada. Environmental Protection Service. Guidelines for Effluent Quality and Wastewater Treatment at Federal Establishments. Federal Activities Environmental Branch, Environmental Conservation Directorate, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.