Não informado. (1946). Water and sewage works. Gillette Publishing Company.
Chicago-viite (17. p.)Não informado. Water and Sewage Works. Chicago, Ill: Gillette Publishing Company, 1946.
MLA-viite (8. p.)Não informado. Water and Sewage Works. Gillette Publishing Company, 1946.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.
