1. Johnson D. Managing knowledge networks. Cambridge: Cambridge University Press; 2009.
2. Silverman J, Kurtz S, Draper J. Skills for communicating with patients. Oxford: Radcliffe; 2005.
3. Littlejohn S, Foss K. Theories of human communication. Belmont, CA: Wadsworth publishing; 2007.
4. Wood J. Interpersonal communication. Belmont, CA: Wadsworth publishing; 2009.
5. Capron A. Advanced directives. In: Kuhse H, Singer P, editors. A companion to bioethics. Oxford: Blackwell; 2001.