APA (7th ed.) Citation

O'Dowd, T., O'Dowd, S., Baker, A., Griffin, F., Stokes, M., Ralston, C., . . . Dursun, S. M. (1993). LETTERS. BMJ: British Medical Journal (International Edition), 307(6897), 198.

Chicago Style (17th ed.) Citation

O'Dowd, Tom, et al. "LETTERS." BMJ: British Medical Journal (International Edition) 307, no. 6897 (1993): 198.

MLA (9th ed.) Citation

O'Dowd, Tom, et al. "LETTERS." BMJ: British Medical Journal (International Edition), vol. 307, no. 6897, 1993, p. 198.