Cite Them Right Harvard referencing style:
You can check the heading "Online Maps" under the subsection "Maps, informational and diagnostic" on the Media and Art section . The required elements for referencing from Google Maps are:
Map publisher (Year of publication) Title of map section, Sheet number or tile, scale. Available at: DOI or URL (Accessed: date).
Example:
Google (2021) Cardiff Bay. Available at: http://maps.google.co.uk (Accessed: 5 July 2021).
