deletions | additions       diff --git a/introduction.md b/introduction.md  index 8048443..e860134 100644  --- a/introduction.md  +++ b/introduction.md 
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You will then include a citation of their work in the reference section.  If you want to cite a web-page that your work is based on you can substitute another url do so like this.   Example: We decided to compare exposure times for different objects with the PROMPT telescopes to the [reccomendations listed  for [this URL](http://adsabs.harvard.edu/abs/1975CMaPh..43..199H). the Faulkes Telescopes] (http://www.faulkes-telescope.com/education/planning/exposures).