APA (7th ed.) Citation

Barker, D. J. P., & Hall, A. J. (1991). Practical epidemiology (Fourth edition.). Churchill Livingstone.

Chicago Style (17th ed.) Citation

Barker, D. J. P., and A. J. Hall. Practical Epidemiology. Fourth edition. Edinburgh ; New York: Churchill Livingstone, 1991.

MLA (9th ed.) Citation

Barker, D. J. P., and A. J. Hall. Practical Epidemiology. Fourth edition. Churchill Livingstone, 1991.