1. Belmong Report. (1978). National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, Department of Health, Education and Welfare (DHEW) (30 Sept 1978). The Belmont report (DHEW Pub. No. (OS) 78-0012). Washington, DC: United States Government Printing Office.
2. Birnbacher, D. (1995). Mehrdeutigkeit im Begriff der Menschenwürde. Aufklärung und Kritik, Sonderheft 1. http://www.gkpn.de/singer1.html. Accessed 25 Oct 2014.
3. Four ethical principles;D Callahan,2000
4. Carse, A. L., & Nelson, H. L. (1996). Rehabilitating care. Kennedy Institute of Ethics Journal, 6, 19–35.
5. CIOMS. (2002). International ethical guidelines for biomedical research involving human subjects. Geneva: CIOMS.