1. Companion to psychiatric studies by Eve C. Johnstone, D.G. Cuningham Owens, S.M. Lawrie, M. Sharpe and C.P.L. Freeman.
2. Oxford handbook of psychiatry by David Semple, Roger Smyth, Jonathan Burns, Rajan Darjee and Andrew McIntosh.
3. The Maudsley prescribing guidelines by David Taylor, Carol Paton and Robert Kerwin.
4. World Health Organization, 2001.