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Steel, C., Garety, P. A., Freeman, D., Craig, E., Kuipers, E., Bebbington, P., Fowler, D., & Dunn, G. (2007). The multidimensional measurement of the positive symptoms of psychosis. International Journal of Methods in Psychiatry, 16(2), 88-96. Recuperado em 08 de Abril, 2014, em http://onlinelibrary.wiley.com/doi/10.1002/mpr.203/full