APA (7th ed.) Citation

British Medical Association, British Cardiac Society, & International Congress of Physicians. Cardiological Section. (1939). British heart journal. British Medical Association.

Chicago Style (17th ed.) Citation

British Medical Association, British Cardiac Society, and International Congress of Physicians. Cardiological Section. British Heart Journal. London: British Medical Association, 1939.

MLA (9th ed.) Citation

British Medical Association, et al. British Heart Journal. British Medical Association, 1939.