The format of the citations on Wikipedia, by and large, follows one of two standard citation models, with the exciting names Citation Style 1 (https://en.wikipedia.org/wiki/Help:Citation_Style_1) and Citation Style 2 (https://en.wikipedia.org/wiki/Help:Citation_Style_2). These are easy to parse, when they are using the standard templates. Lesser used ...
Cities only have point geometry, so how do you define the "boundary"? Taking
https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/queries#Places_within_1_km_of_the_Arc_de_Triomphe_(Q64436) as an example, here are Wikidata entries within 1 km of London:
SELECT ?place ?placeLabel ?page ?location ?dist WHERE
The title field in that datadump appears to be the same as the page title, and thus can be used as the page URL - standard Wikipedia URLs are of the form .../wiki/Page_title
"title": "Preston Tucker",