[Tex/LaTex] Bibliography title fontsize problem with BibTeX and the natbib package

bibliographiesfontsizenatbibsectioning

I'm trying to change the fontsize of the Bibliography title to a normal size but I can't do it.

I already try (without results):

\let\chapter=\chapter

\let\chapter=\section %works, but all the other section titles changes too and it's a mess

\renewcommand{\biblistfont}{
\normalfont
\normalsize}

% this last one show an error
\renewcommand{\bibsection}{%
\titleformat{\chapter} {\normalfont\tiny\filcenter\bfseries}{}{}{}
\titlespacing*{\chapter} {0pt}{60pt}{18pt}
\chapter*{ \bibname \markboth{\bibname}{\bibname}%

Also, this others commands to change the title name are not working (I want NEW TITLE instaed of New Title):

\renewcommand\bibname{New Title}
\renewcommand\refname{New Title}
\addto\captionsngerman{\renewcommand{\refname}{New Title}}

Here is a minimal example of my code:

 \documentclass[letterpaper,oneside,11pt]{book}
 \usepackage[spanish]{babel}
 \usepackage[latin1]{inputenc}
 \usepackage{natbib}
 \usepackage{fancyhdr}

 \pagestyle{fancy}
 \begin{document}
 \chapter{bla}
 Bla bla bla
 \section{bla bla}
 Bla bla bla

 \bibliographystyle{my style}
 \bibliography{my bib}

 \end{document}

Best Answer

Here's one possible solution, using a redefinition of \bibsection, as Marco Daniel suggested in his answer:

\begin{filecontents*}{biblioprueba.bib}
@misc{patashnik,
    author  = "Oren Patashnik",
    title   = "{BibTeX}ing.  {D}ocumentation for General {BibTeX} users",
    year    = "1988",
    howpublished = "Electronic document accompanying BibTeX distribution"
}
\end{filecontents*}

\documentclass[letterpaper,oneside,11pt]{book}
\usepackage[spanish]{babel}
\usepackage{natbib}

\newcommand\mybibname{New Title}
\renewcommand\bibsection{%
   \clearpage
   \noindent\normalsize\MakeUppercase{\mybibname}%
   \markboth{\MakeUppercase{\mybibname}}{\MakeUppercase{\mybibname}}%
  }

\begin{document}

\chapter{bla}
 Bla bla bla
 \section{bla bla}
 Bla bla bla

\cite{patashnik}

\bibliographystyle{plainnat}
\bibliography{biblioprueba}

\end{document}

The code before \documentclass in my example code is just to provide you with a ready to use .bib file so you can simply copy-paste my code as it is and process it in the usual way using (pdf)latex+bibtex+(pdf)latex+(pdf)latex and see the result.

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