1. Pirsig R. Zen and the Art of Motorcycle Maintenance. New York: Bantam Books. 1984:94.
2. U.S. Department of Health and Human Services. National Ambulatory Medical Care Survey: 1989 Summary. Hyattsville, MD: 1992:12–3.
3. Pickering GW. High Blood Pressure. London: J & A Churchill, 1955:10–6.
4. Cantwell JD, Nicolai S. Korotkoff. Clin Cardiol. 1989;12:233–5.
5. Sphygmomanometers: Principles and Precepts. Copiague, NY: W. A. Baum, 1969.