1. AdelsonL. The Pathology of Homicide. Springfield: Charles C Thomas, 1974: 382–6.
2. SpitzWU, FisherRS. Medicolegal Investigations of Death, 2nd edn. Springfield: Charles C Thomas, 1980: 122–5.
3. RentouleE, SmithH. Glaister's Medical Jurisprudence and Toxicology,13th edn. Edinburgh: Churchill Livingstone, 1973: 242–6.
4. CampsFE. Gradwohl's Legal Medicine, 3rd edn. Bristol: John Wright, 1976: 264.