1. Seligman M (1975) Helplessness: on depression, development, and death
2. Marcus M, Yasamy MT, van Ommeren MV, Chisholm D, Saxena S (2012) Depression: a global public health concern
3. World Health Organization (2001) The World Health Report 2001: mental health: new understanding, new hope. World Health Organization, Geneva
4. Castillo R, Carlat D, Millon T, Millon C, Meagher S, Grossman S, Association AP et al (2007) Diagnostic and statistical manual of mental disorders. American Psychiatric Association Press, Washington, DC
5. Folstein MF, Robins LN, Helzer JE (1983) The mini-mental state examination. Arch Gen Psychiatry 40(7):812–812