APA (7e ed.) Bronvermelding

Não informado. (2004). Plumbing, heating, piping. Delta Communications.

Chicago (17e ed.) Bronvermelding

Não informado. Plumbing, Heating, Piping. Chicago, Ill: Delta Communications, 2004.

MLA (8e ed.) Bronvermelding

Não informado. Plumbing, Heating, Piping. Delta Communications, 2004.

Let op: Deze citaties zijn niet altijd 100% accuraat.