APA (7e ed.) Bronvermelding

Não informado. (1935). Architectural concrete. Portland Cement Association.

Chicago (17e ed.) Bronvermelding

Não informado. Architectural Concrete. Chicago, Ill: Portland Cement Association, 1935.

MLA (8e ed.) Bronvermelding

Não informado. Architectural Concrete. Portland Cement Association, 1935.

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