1. Aldwin, C., and T. Revenson. 1986. Vulnerability to economic stress. American Journal of Community Psychology 4(2): 161–175.
2. Ankrah, E.M. 1991. AIDS and the social side of health. Social Science & Medicine 32(9): 967–980.
3. Anonymous. 1980. The hospital industry’s new vulnerability to antitrust. Regulation 4(5): 12–13.
4. Beauchamp, T., and J. Childress. 2012. Principles of biomedical ethics, 7th ed. New York and Oxford: Oxford University Press.
5. Belmont Report. 1979. Ethical principles and guidelines for the protection of human subjects of research, Report of the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research. Federal Register 44(76): 23191–23197.