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3J. Rachels, The End of Life: Euthanasia and Morality, Oxford: Oxford University Press, 1986, pp. 172 - 173.
4W. Wright, "Historical Analogies, Slippery Slopes, and the Question of Euthanasia" , Journal of Law, Medicine & Ethics , 2000 (28), pp. 176 - 186.
5P. Lewis, Assisted Dying and Legal Change, Oxford: Oxford University Press, 2007, pp. 164 -169.
6D. Enoch, "Once You Start Using Slippery Slope Arguments, You're on a Very Slippery Slope" ,Oxford Journal of Legal Studies , 2001 (21), pp. 629 -647.
7Penney Lewis, "The Empirical Slippery Slope from Voluntary to Non - Voluntary Euthanasia", Journal of law, medicine & ethics, 2007 (35), pp. 197 -210.
8R. S. Magnusson, Angels of Death - Exploring the Euthanasia Underground, New Haven: Yale University Press, 2002, p. 229.
9S. W. Smith, "Evidence for the Practical Slippery Slope in the Debate on Physician - Assisted Suicide and Euthanasia," Medical Law Review , 2(K)5 (13), pp. 17-44.
10Penney l.ewis, "The Empirical Slippery Slope from Voluntary to Non - Voluntary Euthanasia", Journal of law, medicine & ethics , 2007 (35), pp. 197 -210.
