APA (7th ed.) Citation

Heasman, P. A., Preshaw, P., & Smith, D. (1997). Periodontology. Churchill Livingstone.

Chicago Style (17th ed.) Citation

Heasman, Peter A., Philip Preshaw, and David Smith. Periodontology. New York: Churchill Livingstone, 1997.

MLA (9th ed.) Citation

Heasman, Peter A., et al. Periodontology. Churchill Livingstone, 1997.