@misc{ enwiki:139048226, author = "{Wikipedia contributors}", title = "International Day of the African Child --- {Wikipedia}{,} The Free Encyclopedia", year = "2007", url = "https://en.wikipedia.org/w/index.php?title=International_Day_of_the_African_Child&oldid=139048226", 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:139048226, author = "{Wikipedia contributors}", title = "International Day of the African Child --- {Wikipedia}{,} The Free Encyclopedia", year = "2007", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=International_Day_of_the_African_Child&oldid=139048226}", note = "[Online; accessed 7-July-2024]" }