APA (7e ed.) Bronvermelding

Não informado. (1930). BTH activities. Associated Electrical Industries.

Chicago (17e ed.) Bronvermelding

Não informado. BTH Activities. Rugby, Inglaterra: Associated Electrical Industries, 1930.

MLA (8e ed.) Bronvermelding

Não informado. BTH Activities. Associated Electrical Industries, 1930.

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