For the Wikipedia element I went to the entry on the writer Garry Wills, and was surprised that the entry was as short as it is given that he has written over 40 books. As his newest book, 'Bomb Power' , has just arrived I thought I would check the accuracy of the ISBN number and sure enough it was wrong - and so I fixed (edited) it - a "minor" edit.
The entry on Wikipedia itself was very good, especially the section on "Using Wikipedia as a Research Tool", and " Strengths, Weaknesses, and Article quality in Wikipedia". This should be mandatory reading for anyone relying on Wikipedia for information.