APA (7th ed.) Citation

British Library of Information (New York, N.Y.). (1941). British Library leaflet. British Library of Information.

Chicago Style (17th ed.) Citation

British Library of Information (New York, N.Y.). British Library Leaflet. New York: British Library of Information, 1941.

MLA (9th ed.) Citation

British Library of Information (New York, N.Y.). British Library Leaflet. British Library of Information, 1941.