Não informado. (2004). Sewage and Industrial Wastes. Federation of Sewage Works Associations.
Lua i Stíl Chicago (17ú heag.)Não informado. Sewage and Industrial Wastes. Champaign, Ill: Federation of Sewage Works Associations, 2004.
Lua MLA (8ú heag.)Não informado. Sewage and Industrial Wastes. Federation of Sewage Works Associations, 2004.
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