@misc{ enwiki:886017835, author = "{Wikipedia contributors}", title = "Balfour Day --- {Wikipedia}{,} The Free Encyclopedia", year = "2019", url = "https://en.wikipedia.org/w/index.php?title=Balfour_Day&oldid=886017835", note = "[Online; accessed 19-June-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:886017835, author = "{Wikipedia contributors}", title = "Balfour Day --- {Wikipedia}{,} The Free Encyclopedia", year = "2019", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Balfour_Day&oldid=886017835}", note = "[Online; accessed 19-June-2024]" }