@misc{ enwiki:1220265900, author = "{Wikipedia contributors}", title = "Defence Helicopter Flying School --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", url = "https://en.wikipedia.org/w/index.php?title=Defence_Helicopter_Flying_School&oldid=1220265900", note = "[Online; accessed 9-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:1220265900, author = "{Wikipedia contributors}", title = "Defence Helicopter Flying School --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Defence_Helicopter_Flying_School&oldid=1220265900}", note = "[Online; accessed 9-July-2024]" }