@misc{ enwiki:1222694349, author = "{Wikipedia contributors}", title = "Middlesex County, Ontario --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", url = "https://en.wikipedia.org/w/index.php?title=Middlesex_County,_Ontario&oldid=1222694349", note = "[Online; accessed 7-July-2024]" }
url
(\usepackage{url}
somewhere in the preamble), which tends to give much more nicely formatted web addresses, the following may be preferred:
@misc{ enwiki:1222694349, author = "{Wikipedia contributors}", title = "Middlesex County, Ontario --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Middlesex_County,_Ontario&oldid=1222694349}", note = "[Online; accessed 7-July-2024]" }