Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.