Não informado. (2004). Plumbing, heating, piping. Delta Communications.
Chicago-viite (17. p.)Não informado. Plumbing, Heating, Piping. Chicago, Ill: Delta Communications, 2004.
MLA-viite (8. p.)Não informado. Plumbing, Heating, Piping. Delta Communications, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.