 @misc{ wiki:xxx,
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   year = "2018",
   url = "https://commons.wikimedia.org/w/index.php?title=File:Erdhummel_(Bombus_terrestris)2.jpg&oldid=304892818",
   note = "[Online; accessed 17-July-2018]"
 }

 @misc{ wiki:xxx,
   author = "Wikimedia Commons",
   title = "File:Cryptomeria japonica MHNT.BOT2004.0.64.jpg --- Wikimedia Commons{,} the free media repository",
   year = "2016",
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   note = "[Online; accessed 17-August-2018]"
 }

