Beck, AT; Steer, RA; Kovacs, M (1985), «Hopelessness and eventual suicide: a 10-year prospective study of patients hospitalized with suicidal ideation», American Journal of Psychiatry142 (5): 559-563, PMID3985195, doi:10.1176/ajp.142.5.559.
Beck, AT; Weissman, A; Lester, D; Trexler, L (1974), «The measurement of pessimism: the hopelessness scale», Journal of Consulting and Clinical Psychology (Journal of Consulting and Clinical) 42 (6): 861-5, PMID4436473, doi:10.1037/h0037562.
Beck, AT; Steer, RA; Kovacs, M (1985), «Hopelessness and eventual suicide: a 10-year prospective study of patients hospitalized with suicidal ideation», American Journal of Psychiatry142 (5): 559-563, PMID3985195, doi:10.1176/ajp.142.5.559.
Beck, AT; Weissman, A; Lester, D; Trexler, L (1974), «The measurement of pessimism: the hopelessness scale», Journal of Consulting and Clinical Psychology (Journal of Consulting and Clinical) 42 (6): 861-5, PMID4436473, doi:10.1037/h0037562.