Certain institutions may ask you to separate your bibliography into papers an online references. Here's how to accomplish this using LaTeX and biblatex

testbib.tex

\documentclass{article}
\usepackage[backend=bibtex]{biblatex}
\bibliography{database.bib}
\begin{document}
According to \cite{foo1999} blah blah.
According to \cite{bar1999} blah blah.
 
\defbibfilter{papers}{
  type=article or
  type=inproceedings or
  type=book
}
 
\defbibfilter{online}{
  type=online
}
 
\printbibliography[filter=papers]
\printbibliography[filter=online]
 
\end{document}

database.bib

@article{foo1999,
  title={Buchtitel},
  author={Doe, John},
  keywords={book},
  journal={International Journal of Nonsense},
  year={1999}
}
 
@online{bar1999,
  author = {Ford, Rebecca},
  keywords={internet},
  title  = {Earthquake: Twitter Users Learned of Tremors
            Seconds Before Feeling Them},
  date   = {2011-08},
  url    = {http://www.hollywoodreporter.com/news/earthquake-twitter-users-learned-tremors-226481}
}

For tests save the two files and compile using

latex
biber
latex

or better:

latexmk

For more information read the official docs: http://tug.ctan.org/macros/latex/exptl/biblatex/doc/biblatex.pdf