APA (7th ed.) Citation

Kelly, I., Frith, P., Hyman, N., & Jewell, D. (1990). Retinal periphlebitis in ulcerative colitis. BMJ Publishing Group.

Chicago Style (17th ed.) Citation

Kelly, I., P. Frith, N. Hyman, and D. Jewell. Retinal Periphlebitis in Ulcerative Colitis. BMJ Publishing Group, 1990.

MLA (9th ed.) Citation

Kelly, I., et al. Retinal Periphlebitis in Ulcerative Colitis. BMJ Publishing Group, 1990.