@misc{ enwiki:1212939100, author = "{Wikipedia contributors}", title = "Advent är mörker och kyla --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", url = "https://en.wikipedia.org/w/index.php?title=Advent_%C3%A4r_m%C3%B6rker_och_kyla&oldid=1212939100", note = "[Online; accessed 12-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:1212939100, author = "{Wikipedia contributors}", title = "Advent är mörker och kyla --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Advent_%C3%A4r_m%C3%B6rker_och_kyla&oldid=1212939100}", note = "[Online; accessed 12-July-2024]" }