Lester D. The effectiveness of suicide prevention centers : a review. Suicide and life-threatening behavior 1997 ; 27(3): 304-10.
Miller HL, Coombs DW, Leeper JD, et al. An analysis of the effects of suicide prevention facilities on suicide rates in the United States. American Journal of Public Health 1984 ; 74 ( 4 ) : 340-3.
Gould MS, Kalafat J, Harrismunfakh JL, et al. An evaluation of crisis hotline outcomes. Part 2 : Suicidal callers. Suicide and life-threatening behavior 2007 ; 37 ( 3 ) : 338-52.
King R, Nurcombe B, Bickman L, et al. Telephone counselling for adolescent suicide prevention : changes in suicidality and mental state from beginning to end of a counselling session. Suicide and life-threatening behavior 2003 ; 33 ( 4 ) : 400-11.