Penn, D. L.; Roberts, D. L.; Combs, D.; Sterne, A. (2007). "Best Practices: The Development of the Social Cognition and Interaction Training Program for Schizophrenia Spectrum Disorders". Psychiatric Services. 58 (4): 449–51. doi:10.1176/appi.ps.58.4.449. PMID 17412842.