1. Principles of Biomedical Ethics;Beauchamp,1994
2. Seeking patients' consent in anaesthesiology: consent in clinical practice;De Roubaix;SAJA,2005
3. Informed consent for anesthesia in ambulatory surgery: a South African perspective;De Roubaix;Ambul Surg,2006
4. Living in the age of consent;Haslam;MPS UK Casebook,2004
5. Two Concepts on Liberty;Berlin,1969