Adapted the URL links in Wikipedia refs.

bibliography.bib

@@ -202,14 +202,14 @@
   author = {Wikipedia contributors},
   title = {{Plagiarism -- Wikipedia, The Free Encyclopedia}},
   year = {2004},
-  url = {http://en.wikipedia.org/w/index.php?title=Plagiarism\&oldid=5139350},
+  howpublished = {\href{http://en.wikipedia.org/w/index.php?title=Plagiarism\&oldid=5139350}{http://en.wikipedia.org/w/index.php?title=Plagiarism\&oldid=5139350}},
-  note = {Online; accessed 22-July-2004]}
+  note = {[Online; accessed 22-July-2004]}
 }
 
 @Misc{wikipedia:citing,
   author = {Wikipedia contributors},
   title = {{Citing Wikipedia}},
   year = {2018},
-  url = {https://en.wikipedia.org/w/index.php?title=Wikipedia:Citing_Wikipedia\&oldid=846491764},
+  howpublished = {\href{https://en.wikipedia.org/w/index.php?title=Wikipedia:Citing\_Wikipedia\&oldid=918052627}{https://en.wikipedia.org/w/index. php?title=Wikipedia:Citing\_Wikipedia\&oldid=918052627}},
-  note = {Online; accessed 01-November-2018]}
+  note = {[Online; accessed 22-October-2019]}
 }