to the guidance published by your educational establishment.
In the absence of advice the site authors suggest the following method:
Author or editor, year of publication, title
Maidstone, Kent, England, <http://kentarchaeology.ac/(rest of
URL) [Accessed (date)]
within the text [Ashbee (2002) pp. 3 - 4]
Ashbee, P., 2002, Great
Tottington's Sarson Stones
, [Internet] K.A.S.,
Kent, England <http://www.kentarchaeology.ac
[Accessed 1st June 2008]
Some establishments prefer the full URL.