Daroff R, Fenichel G, Jankovic J, Mazziotta J. 2012. Bradley's neurology in clinical practice [6th ed.].
Cecil RL, Goldman L, Schafer AI. 2012. Goldman's Cecil medicine (24th ed.) Philadelphia: Elsevier/Saunders.
Moses S. Altered level of consciousness. Accessed August 18, 2012. http://www.fpnotebook.com/neuro/LOC/AltrdLvlOfCnscsns.htm
Rakel RE, Rakel D. 2011. Textbook of family medicine (8th ed.). Philadelphia: Elsevier/Saunders.