[Tex/LaTex] Sort References Yearly

bibtexsorting

I need to Sort my references yearly, right now i have tried unsrt, plain. both of them are not working. I have written my bib file according to year though. All i need is to have my references sorted in yearly order. 

\documentclass{article}
\usepackage{times} 


\begin{document}
 This is the example\cite{pena2015galean} and then this one\cite{ostergaard2010diagnosing}. Thanks \cite{pena20galean}

\pagebreak
\bibliographystyle{unsrt}
\bibliography{mybib}

\end{document}

if this is my bib file. 

@inproceedings{pena2015galean,
  title={Galean: Visualization of Geolocated News Events from Social Media},
  author={Pe{\~n}a-Araya, Vanessa and Quezada, Mauricio and Poblete, Barbara},
  booktitle={Proceedings of the 38th International ACM SIGIR Conference on Research and Development in Information Retrieval},
  pages={1041--1042},
  year={2015},
  organization={ACM}
}

@inproceedings{pena20galean,
  title={xxx},
  author={yyyy},
  booktitle={zzzzz},
  pages={1041--1042},
  year={2009},
  organization={ACM}
}

@article{ostergaard2010diagnosing,
  title={Diagnosing the online information search behavior of commercial airline travelers},
  author={{\O}stergaard, Stine and M{\"o}ller, L{\'a}ra},
  year={2010}
}

Best Answer

You've indicated that all entries in the bib file are already sorted chronologically. If, moreover, all entries are to be shown in the formatted bibliography, you may achieve your objective by using the unsrt bibliography style and issuing the instruction

\nocite{*}

immediately after \begin{document}. Of course, use \cite instructions throughout the body of the document to generate the desired citation call-outs.

After changing the argument of \bibliographystyle, be sure to rerun LaTeX, BibTeX, and LaTeX twice more to fully propagate all changes.

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