APA (7e ed.) Bronvermelding

Não informado. (1950). Water and sanitary engineer. DR Publications.

Chicago (17e ed.) Bronvermelding

Não informado. Water and Sanitary Engineer. Surrey, Inglaterra: DR Publications, 1950.

MLA (8e ed.) Bronvermelding

Não informado. Water and Sanitary Engineer. DR Publications, 1950.

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