1. Alexander, L. (2002). Criminal liability for omissions. In: S. Shute, & A. P. Simester (Eds.), Criminal Law Theory: Doctrines of the General Part (p. 127). Oxford: Oxford University Press.
2. Ashworth, A. J. (2006). Principles of criminal law (5th ed., pp. 259–260). Oxford: Oxford University Press.
3. Barnes, J. (1990). A history of the world in 10 and a half chapter. London: Picador.
4. Blom-Cooper, L., & Morris, T. (2004). With malice aforethought: A study of the crime and punishment for homicide (pp. 174–175). Oxford: Hart.
5. Criminal Law Revision Committee (1976). Working paper on offences against the person. London: HMSO, p. 33.