5Ernest van den Haag and John P Conrad, The Death Penalty: A Debate, New York and London: Plenum Press, 1983, pp. 157- 158.
6Hugo Adam Bedau, Death Is Different : Studies in the Morality, Law and Politics of Capital Punishment, Boston:Northeastern University Press, 1987, p.92.
7Adrew yon Hirseh,Past or Future Crime: Deservedness and Dangerorsness in the Sentencing of Criminals, New Brunswick and London Rutgers University Press, 1987,p. 10.