Não informado. (2004). Sewage Works Journal. Federation of Sewage Works Associations.
Chicago (17e ed.) BronvermeldingNão informado. Sewage Works Journal. Easton, Pa: Federation of Sewage Works Associations, 2004.
MLA (8e ed.) BronvermeldingNão informado. Sewage Works Journal. Federation of Sewage Works Associations, 2004.
Let op: Deze citaties zijn niet altijd 100% accuraat.