[Tex/LaTex] Changing the heading style of references section

bibliographiessectioning

\documentclass[twoside, a4paper, 11pt]{article}
\usepackage{natbib}

\begin{document}



\bibliographystyle{apa-good}
\bibliography{bibliography}
\end{document}

How can I make the section header for my references list bolded, underlined, all capitalized, 11 pt and with C6. in front of it? I.e., currently, the section header is: References however I would like it to be:

enter image description here

EDIT:

\documentclass[twoside, a4paper, 9pt]{article}
\usepackage{natbib}

\renewcommand{\refname}{C6.~REFERENCES}
\makeatletter
\renewcommand\bibsection{%
  \section*{\underline{\refname}\@mkboth{\MakeUppercase{\refname}}{\MakeUppercase{\refname}}}%
}%
\makeatother



\begin{document}

\underline{\textbf{C1. PROJECT TITLE}}

blkah blah

\underline{\textbf{C2. AIMS AND BACKGROUND}}


blah blah blah

\bibliographystyle{apa-good}
\bibliography{bibliography}
\end{document}

The output is:

enter image description here

The size of references doesn't change when I change the font size to 9pt. I know I should use \section for section titles but there is a reason why I am manually creating section titles. So how can I get the references heading size to be the same as my manually made ones?

Best Answer

If you are sure that you are using the article document class, just adding the following lines in your preamble should work:

\renewcommand{\refname}{C6.~REFERENCES}
\makeatletter
\renewcommand\bibsection{%
  \section*{{\normalsize\underline{\refname}}\@mkboth{\MakeUppercase{\refname}}{\MakeUppercase{\refname}}}%
}%
\makeatother

MWE

\documentclass[twoside, a4paper, 11pt]{article}

\begin{filecontents*}{bibliography.bib}
@article{reference,
author = {F Author and S Author},
journal = {Journal},
title = {Article Title},
year = {2013},
month = {10},
}
\end{filecontents*}

\usepackage{natbib}

\renewcommand{\refname}{C6.~REFERENCES}
\makeatletter
\renewcommand\bibsection{%
  \section*{{\normalsize\underline{\refname}}\@mkboth{\MakeUppercase{\refname}}{\MakeUppercase{\refname}}}%
}%
\makeatother

\begin{document}

\nocite{*}

\bibliographystyle{apa-good}
\bibliography{bibliography}

\end{document}

Output:

enter image description here

If you also want to remove the spacing add \vspace*{-.8\baselineskip} in the above definition, so to have

\renewcommand{\refname}{C6.~REFERENCES}
\makeatletter
\renewcommand\bibsection{%
  \section*{{\normalsize\underline{\refname}}\@mkboth{\MakeUppercase{\refname}}{\MakeUppercase{\refname}}}\vspace*{-.8\baselineskip}%
}%
\makeatother

Output:

enter image description here