1. http://www.niso.org.
2. http://www.ansi.org.
3. For a list of the NISO standards in the Z39 range, see http://www.niso.org/standards/quick_list.html (accessed 4/11/2005).
4. http://www.iso.org.
5. http://www.niso.org/international/TC46/index.html (accessed 4/11/2005).