How to shrink the font size of references in Beamer

Question

I'm preparing slides for my dissertation proposal. I want to include my bibliography on the last slide, but the references don't quite fit on one slide. Here's a small example of what I'm trying to accomplish:

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{bm}
\usepackage[utf8]{inputenc}
\usepackage{apacite}

\title[A BNP Beta-Mixture IRT Model]
{A Bayesian Nonparametric Beta-Mixture\\Item Response Model}
\author[E. A. Arenson]
{Ethan A. Arenson}
\date{August 30, 2017}

\begin{document}

\begin{frame}
\frametitle{Sample Slide}
Random text \cite{Random Author}
\end{frame}

\begin{frame}
\frametitle{References}
\footnotesize
\bibliographystyle{apacite}
\bibliography{Dissertation}
\end{frame}
\end{document} 

The \footnotesize command in the "References" frame does not reduce the font size of the references. How can I either reduce the font size or split the reference list across two slides?

Answer 1

It is in the manual of apacite.

\documentclass{beamer}
\usepackage{apacite}
\renewcommand\bibliographytypesize{\footnotesize}
\begin{document}

\nocite{knuth:ct:c}

\begin{frame}{References}
  \bibliographystyle{apacite}
  \bibliography{biblatex-examples}
\end{frame}

\end{document}