Harvard referencing examples
Mason, J 1832, Map of the countries lying between Spain and India,1:8,000,000, Ordnance Survey, London.
Or if the originator is not known:
Title of map Year, Scale of map, Publisher, Place of publication.
In-text citation: (Mason 1832)
Geoscience Australia [NATMAP] 2004, ACT region, New South Wales and Australian Capital Territory, map, Geoscience Australia, Canberra.
Hawaii n.d., map, viewed 20 July 2012, <http://3.bp.blogspot.com/-6Ckq2CCag0Q/Tr4plGlC-HI/AAAAAAAACLo/CjKZCLjyAvk/s1600/islands-of-hawaii-map.gif>
