APA (7e ed.) Bronvermelding

Não informado. (1942). Machine tools. National Machine Tool Builders Association.

Chicago (17e ed.) Bronvermelding

Não informado. Machine Tools. Cleveland, Ohio: National Machine Tool Builders Association, 1942.

MLA (8e ed.) Bronvermelding

Não informado. Machine Tools. National Machine Tool Builders Association, 1942.

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