Can't include a reference with BibTex

I want to include a reference. For this purpose, I create a file called References.bib in which I put this:

 @article{ref,
   author={First author, Second Author and Third author},
   title={Title of the article},
   journal={},
   year = 2005
 }

Then in the latex file I include the refrence by:

 \cite{ref}

I also include in the beginning:

  \usepackage{natbib}

And at the end before the end document:

 \bibliographystyle{te}
 \bibliography{References}

I get a question mark instead of the reference. I don't know what's wrong with my code ? Thank you in advance !!