1. The aggregate burden of crime;Anderson;Journal of Law and Economics,1999
2. 2. Nwankwo BO. Mental and Emotional Health. Owerri: Megasoft publishers 2006a. ISBN978-36223-4.
3. 3. Robert A. Mental health history timelines. Middlesex University. 1981. Retrieved on 28/3/2010@8p.m.http//studymre.org.uk/mhhtim.htm.
4. 4. Hayes N, Minardi H. Psychology and Ageing. Chap 7. In: Woodrow, P, ed. Ageing-issues for physical, psychological and social health. London: Whurr Publishers Ltd 2002:93- 114.
5. 5. Hayes N, Minardi H. Abnormal psychology in old age. Chap 8. In: Woodrow P, ed. Ageing- issues for physical, psychological and social health. London: Whurr Publishers Ltd 2002:115-38.