@misc{ enwiki:154141810, author = "{Wikipedia contributors}", title = "UFC 39 --- {Wikipedia}{,} The Free Encyclopedia", year = "2007", url = "https://en.wikipedia.org/w/index.php?title=UFC_39&oldid=154141810", note = "[Online; accessed 30-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:154141810, author = "{Wikipedia contributors}", title = "UFC 39 --- {Wikipedia}{,} The Free Encyclopedia", year = "2007", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=UFC_39&oldid=154141810}", note = "[Online; accessed 30-June-2024]" }