Bibliography in table of contents

To get the bibliography to be listed in the ToC as an unnumbered sectional unit (chapter or section), use tocbibind without the numbib option:

\usepackage[nottoc,notlot,notlof]{tocbibind}

Another option would be to use the etoolbox package to patch \thebibliography to use \addcontentsline:

\documentclass{book}
\usepackage{etoolbox}

\apptocmd{\thebibliography}{\csname phantomsection\endcsname\addcontentsline{toc}{chapter}{\bibname}}{}{}

\begin{document}
\tableofcontents
\include{chapter1}
\bibliographystyle{plain}
\bibliography{biblio}
\end{document}

A very easy way is to include following line before the bibliography starts, at the end of the document.

\addcontentsline{toc}{chapter}{Bibliography}

here is the original post: Insert bibliography into table of content

Placing the

\addcontentsline{toc}{chapter}{Bibliography}

immediately below the

\begin{thebibliography}

seems to work.