1. Cresswell J. The Oxford dictionary of word origins. Oxford: Oxford University Press; 2009. Available from:
http://www.oxfordreference.com/views/BOOK_SEARCH.html?book=t292
2. Marin RS. Apathy: a neuropsychiatric syndrome. J Neuropsychiatry Clin Neurosci. 1991;3:243–54.
3. Marin RS, Biedrzycki RC, Firinciogullari S. Reliability and validity of the Apathy Evaluation Scale. Psychiatry Res. 1991;38:143–62.
4. American Psychological Association. In: VandenBos GR, editor in Chief. APA dictionary of psychology. Washington, D.C.: American Psychological Association; 2007.
5. Marin RS. Apathy: concept, syndrome, neural mechanisms, and treatment. Semin Clin Neuropsychiatry. 1996;1:304–14.