install natlib in mac

Install :
1) kpsewhich -var-value TEXMFHOME

--- /Users/username/Library/texmf

2) Download the natlib from CTAN to /Users/username/Library/texmf/tex/natlib

3) Dowload the natlib.sty to /Users/username/Library/texmf/latex

3) sudo texhash

4) pdflatex file.tex

    bibtex file.aux

    pdflatex file.tex
    pdflatex file.tex

In the file.tex:

\usepackage[square]{natbib}

\bibpunct{(}{)}{,}{a}{}{,}

\bibliographystyle{plainnat}

\bibliography{myref}

Note: the myref is the myref.bib which contains the references.

In the file myref.bib:
The format should be correct. For example:


@article{itrf2008,
year={2011},
issn={0949-7714},
journal={Journal of Geodesy},
volume={85},
number={8},
doi={10.1007/s00190-011-0444-4},
title={ITRF2008: an improved solution of the international terrestrial reference frame},
url={http://dx.doi.org/10.1007/s00190-011-0444-4},
publisher={Springer-Verlag},
keywords={Reference systems; Reference frames; ITRF; Earth rotation},
author={Altamimi, Zuheir and Collilieux, Xavier and Métivier, Laurent},
pages={457-473},
language={English}
}

Get the bibtex format of the paper either through http://adsabs.harvard.edu/, or through the journal website.