Cita APA

Walker, B. R., & Ralston, S. H. (2010). Davidson's Principles and Practice of Medicine (21st ed.). Elsevier.

Citación estilo Chicago

Walker, Brian R., and Stuart H. Ralston. Davidson's Principles and Practice of Medicine. 21st ed. London: Elsevier, 2010.

Cita MLA

Walker, Brian R., and Stuart H. Ralston. Davidson's Principles and Practice of Medicine. 21st ed. Elsevier, 2010.