@misc{ enwiki:284882237, author = "{Wikipedia contributors}", title = "Composite propellant --- {Wikipedia}{,} The Free Encyclopedia", year = "2009", url = "https://en.wikipedia.org/w/index.php?title=Composite_propellant&oldid=284882237", 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:284882237, author = "{Wikipedia contributors}", title = "Composite propellant --- {Wikipedia}{,} The Free Encyclopedia", year = "2009", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Composite_propellant&oldid=284882237}", note = "[Online; accessed 9-July-2024]" }