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Citation styles for CO concentrations in Europe

APA style

CO concentrations in Europe. (2011, December 7). Opasnet, . Retrieved 01:02, November 10, 2025 from https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004.

MLA style

"CO concentrations in Europe." Opasnet, . 7 Dec 2011, 09:09 UTC. 10 Nov 2025, 01:02 <https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004>.

MHRA style

Opasnet contributors, 'CO concentrations in Europe', Opasnet, , 7 December 2011, 09:09 UTC, <https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004> [accessed 10 November 2025]

Chicago style

Opasnet contributors, "CO concentrations in Europe," Opasnet, , https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004 (accessed November 10, 2025).

CBE/CSE style

Opasnet contributors. CO concentrations in Europe [Internet]. Opasnet, ; 2011 Dec 7, 09:09 UTC [cited 2025 Nov 10]. Available from: https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004.

Bluebook style

CO concentrations in Europe, https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004 (last visited November 10, 2025).

BibTeX entry

 @misc{ wiki:xxx,
   author = "Opasnet",
   title = "CO concentrations in Europe --- Opasnet{,} ",
   year = "2011",
   url = "https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004",
   note = "[Online; accessed 10-November-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 = "Opasnet",
   title = "CO concentrations in Europe --- Opasnet{,} ",
   year = "2011",
   url = "\url{https://en.opasnet.org/index.php?title=CO_concentrations_in_Europe&oldid=23004}",
   note = "[Online; accessed 10-November-2025]"
 }