These are treated much like electronic journal and book references: use journal style for articles and book style for monographs. Note: As with electronic journal references, of the dates published, updated, and accessed, often only the accessed date will be available.
1. Jacob Siegel; Administration on Aging. Aging into the 21st century. http://www.aoa.gov/prof/Statistics/future_growth/aging21/aging_21.asp. Published May 31, 1996. Accessed December 6, 2005.
2. World Medical Association. Declaration of Helsinki: ethical principles for medical research involving human subjects. http://www.wma.net/e/policy/b3.htm. Updated June 10, 2002. Accessed February 26, 2004.
3. US Department of Health and Human Services. Protection of human subjects. 45 CFR §46. http://www.hhs.gov/ohrp/humansubjects/guidance/45cfr46.htm. Revised November 13, 2001. Effective December 13, 2001. Accessed February 27, 2004.
4. World Health Organization. Equitable access to essential medicines: a framework for collective action. http://whqlibdoc.who.int/hq/2004/WHO_EDM_2004.4.pdf. Published March 2004. Accessed December 6, 2005.
In the 2 examples below, the number of the working paper (example 5) and the publication number (example 6) provide information in addition to the URL and could prove helpful should the URLs change.
5. Dafney L, Gruber J. Does public insurance improve the efficiency of medical care? Medicaid expansions and child hospitalizations. http://www.nber.org/papers/w7555. National Bureau of Economic Research working paper w7555. Published February 2000. Accessed February 26, 2004.
6. Johnson DL, O'Malley PM, Bachman JG. Secondary School Students. Bethesda, MD: National Institute on Drug Abuse; 2001. Monitoring the Future: National Survey Results on Drug Use, 1975–2000; vol 1. NIH publication 01–4924. http://www.monitoringthefuture.org/pubs/monographs/vol1_2000.pdf. Published August 2001. Accessed February 27, 2004.