@misc{ enwiki:1229006333,
author = "{Wikipedia contributors}",
title = "2019 redefinition of the SI base units --- {Wikipedia}{,} The Free Encyclopedia",
year = "2024",
url = "https://en.wikipedia.org/w/index.php?title=2019_redefinition_of_the_SI_base_units&oldid=1229006333",
note = "[Online; accessed 11-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:1229006333,
author = "{Wikipedia contributors}",
title = "2019 redefinition of the SI base units --- {Wikipedia}{,} The Free Encyclopedia",
year = "2024",
howpublished = "\url{https://en.wikipedia.org/w/index.php?title=2019_redefinition_of_the_SI_base_units&oldid=1229006333}",
note = "[Online; accessed 11-July-2024]"
}