# Ans. B1

If you have a bibdatabase file, please follow the coding which is given below:

  \bibliographystyle{elsarticle-harv}
\bibliography{your bibdatabase file}

For example, if you have a bibdatabase file called mybib.bib, your code will look like:

  \bibliographystyle{elsarticle-harv}
\bibliography{mybib}

If you do not have a bibdatabase file and you are inputting the bibitems into the TeX file directly, the coding should look like:

  \begin{thebibliography}{00}
\bibitem[Author(year)]{label} Author, A., .....
......
......
\end{thebibliography}

For example:

  \begin{thebibliography]{00}
\bibitem[{Allen and Brooks(1991)}]{Allen1991}
S.~W. Allen and L.~R. Brooks, Specializing the operation of an explicit rule, Journal of Experimental Psychology: General, 120 (1991) 3--19.
\end{thebibliography}

Do not forget to add the documentclass option authoryear.