APA (7e ed.) Bronvermelding

Não informado. (1930). Lead. Lead Industries Association.

Chicago (17e ed.) Bronvermelding

Não informado. Lead. New York: Lead Industries Association, 1930.

MLA (8e ed.) Bronvermelding

Não informado. Lead. Lead Industries Association, 1930.

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