To add a new reference, add the BibTeX entry to biblio.bib, and add a citation to the appropriate section of
example.tex;  e.g.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

@BOOK{RHLStatsBook,
   author = {{Lupton}, R.~H.},
    title = "{Statistics in theory and practice}",
publisher = {Princeton University Press},
     year = 1993,
   adsurl = {http://adsabs.harvard.edu/abs/1993stp..book.....L},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

and

\cite{RHLStatsBook}

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

N.b. Please check that your BibTeX entry is written in ascii, some entries you find on the net use
more general character sets.  The entry will probably work, but will generate complaints.