How to decrease the font size of 'References'? I want to make it 11pt fontsize.
\documentclass[a4paper,oneside,11pt]{article}
\usepackage[left=2.5cm,right=2.5cm,top=4cm,bottom=2.7cm]{geometry}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{enumitem}
\usepackage{array}
\usepackage{mathptmx}
\usepackage{hyperref}
\usepackage{changepage}
\tolerance=1
\emergencystretch=\maxdimen
\hyphenpenalty=10000
\hbadness=10000
\AtBeginDocument{%
\addtolength\abovedisplayskip{-0.2\baselineskip}%
\addtolength\belowdisplayskip{-0.2\baselineskip}%
}
\begin{document}
\allowdisplaybreaks
\vspace*{79.4pt}
\begingroup
\fontsize{17}{0.7cm}\selectfont
\begin{flushleft}
\textbf{\uppercase{TITLE OF ARTICLE
}}
\end{flushleft}
\endgroup
\vspace{28.35pt}
\begin{adjustwidth}{25mm}{0mm}
\textbf{Name}\vspace{5.65pt}\
Institution and adresses\
\
email \vspace{12pt}\
\begingroup
\fontsize{10}{12}\selectfont
\textbf{Abstract.}
In this paper, we introduce about blablabla.
\vspace{6pt}\
\textbf{Keywords}: blablabla\vspace{10mm}
\endgroup
\end{adjustwidth}
\begin{thebibliography}{999}
\bibitem{yesyesyes}
Author,
\emph{Book title}.
publisher, city,
2nd Edition,
2020.
\end{thebibliography}
\end{document}


\begin{thebibliography}{999}to either\begin{thebibliography}{99}(if there are between 10 and 99 entries) or\begin{thebibliography}{9}(if there are fewer than 10 entries). – Mico Oct 29 '20 at 05:45\sectionis and I believe that it should have the same impact on the reader as an unnumbered section. – Peter Wilson Oct 29 '20 at 18:21