Wikipedia is a Mess, Wikipedians Say: 1 in 20 Articles Bare of References

http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2011-10-31/Opinion_essay

Sven Manguard,talks about citation

The word "source" in Wikipedia has three meanings: the work itself (a document, article, paper, or book), the creator of the work (for example, the writer), and the publisher of the work (for example, The New York Times). All three can affect reliability.
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Here is a recent example

A metallica concert was cancelled in delhi but the media (papers ) reported that the concert took place