APA (7th ed.) Citation

Hill, A. B., & Hill, I. D. (1991). Bradford Hill's Principles of Medical Statistics (12th ed.). B. I. Publications.

Chicago Style (17th ed.) Citation

Hill, Austin Bradford, and I. D. Hill. Bradford Hill's Principles of Medical Statistics. 12th ed. New Delhi: B. I. Publications, 1991.

MLA (9th ed.) Citation

Hill, Austin Bradford, and I. D. Hill. Bradford Hill's Principles of Medical Statistics. 12th ed. B. I. Publications, 1991.