Ellis H, Feldman S, Harrop-Griffiths W: The cervical plexus.(Anatomy for anaesthetists, 8th ed.) Massachusetts, Blackwell Publishing, 2004, 146-153
Buckley FP: Regional anesthesia with local anesthetics.(Loeser JD, ed: Bonica’s Management of Pain.) Philadelphia, Lippincott Williams & Wilkins, 2001, 1893-1952