We're using the reference tag as a workaround for printing urls for learners who may not have access to the web when using the text. I think for the purposes of the OER handbook that we try and be consistent within the handbook.
Citations can be tricky -- because most of the Commonwealth use the Harvard method which is not universal. User:Kruhly is working on citation templates. Not all Wikipedia's citation templates are operational on WE.
But do agree with the recommendation for consistence within the OER handbook.