APA (7e ed.) Bronvermelding

Não informado. (1937). Concrete for railways. Portland Cement Association.

Chicago (17e ed.) Bronvermelding

Não informado. Concrete for Railways. Chicago, Ill: Portland Cement Association, 1937.

MLA (8e ed.) Bronvermelding

Não informado. Concrete for Railways. Portland Cement Association, 1937.

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