Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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