Aipuak

NGC 6509. (2023, abendua 19). Wikipedia, Entziklopedia askea. Noiz ikusia: 08:50, urtarrila 11, 2025 from https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402.

"NGC 6509." Wikipedia, Entziklopedia askea. 19 Abe 2023, 10:59 UTC. 11 Urt 2025, 08:50 <https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402>.

Wikipedia contributors, 'NGC 6509', Wikipedia, Entziklopedia askea, 19 abendua 2023, 10:59 UTC, <https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402> [accessed 11 urtarrila 2025]

Wikipedia contributors, "NGC 6509," Wikipedia, Entziklopedia askea, https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402 (accessed urtarrila 11, 2025).

Wikipedia contributors. NGC 6509 [Internet]. Wikipedia, Entziklopedia askea; 2023 Abe 19, 10:59 UTC [cited 2025 Urt 11]. Available from: https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402.

NGC 6509, https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402 (last visited urtarrila 11, 2025).

 @misc{ wiki:xxx,
   author = "Wikipedia",
   title = "NGC 6509 --- Wikipedia{,} Entziklopedia askea",
   year = "2023",
   url = "https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402",
   note = "[Online; accessed 11-urtarrila-2025]"
 }

When using the LaTeX package url (\usepackage{url} somewhere in the preamble) which tends to give much more nicely formatted web addresses, the following may be preferred:

 @misc{ wiki:xxx,
   author = "Wikipedia",
   title = "NGC 6509 --- Wikipedia{,} Entziklopedia askea",
   year = "2023",
   url = "\url{https://eu.wikipedia.org/w/index.php?title=NGC_6509&oldid=9499402}",
   note = "[Online; accessed 11-urtarrila-2025]"
 }