无法在我的文档中获取 ACM 参考文献

Question

我使用 ACM 参考文献格式，但在参考文献部分我没有得到参考文献列表。此外，在文本中，我在引用中看到问号。我下载了以下文件用于参考文献格式：

ACM 参考格式期刊

来自ACM网站：https://www.acm.org/publications/acm-latex-style-guide

这是我的.tex 最小脚本，其中包含一个引用：

% TEMPLATE for Usenix papers, specifically to meet requirements of
%  USENIX '05
% originally a template for producing IEEE-format articles using LaTeX.
%   written by Matthew Ward, CS Department, Worcester Polytechnic Institute.
% adapted by David Beazley for his excellent SWIG paper in Proceedings,
%   Tcl 96
% turned into a smartass generic template by De Clarke, with thanks to
%   both the above pioneers
% use at your own risk.  Complaints to /dev/null.
% make it two column with no page numbering, default is 10 point

% Munged by Fred Douglis <[email protected]> 10/97 to separate
% the .sty file from the LaTeX source template, so that people can
% more easily include the .sty file into an existing document.  Also
% changed to more closely follow the style guidelines as represented
% by the Word sample file. 

% Note that since 2010, USENIX does not require endnotes. If you want
% foot of page notes, don't include the endnotes package in the 
% usepackage command, below.


% This version uses the latex2e styles, not the very ancient 2.09 stuff.
\documentclass[letterpaper,twocolumn,10pt]{article}
\usepackage{endnotes}
\usepackage{color}
\usepackage{textcomp}


\begin{document}

%don't want date printed
\date{}

%make title bold and 14 pt font (Latex default is non-bold, 16 pt)
\title{\Large \bf Test}

%for single author (just remove % characters)
\author{
{\rm Your N.\ Here}\\
Your Institution
\and
{\rm Second Name}\\
Second Institution
% copy the following lines to add more authors
% \and
% {\rm Name}\\
%Name Institution
} % end author

\maketitle

% Use the following at camera-ready time to suppress page numbers.
% Comment it out when you first submit the paper for review.
\thispagestyle{empty}


\subsection*{Abstract}

\section{Introduction}
testing\endnote{ss} abstract \cite{spielberger2010test}


{\footnotesize \bibliographystyle{ACM-Reference-Format-Journals}
\bibliography{references}}
\theendnotes

\end{document}

另外，这是 ref.bib 文件：

%%
%% WinShell 3.3.2.6
%% http://www.winshell.org/
%%

% Strings


% Preamble


% BibTeX Entries
@book{spielberger2010test,
  title={Test anxiety inventory},
  author={Spielberger, Charles D},
  year={2010},
  publisher={Wiley Online Library}
}

你能帮助找出问题的根源吗？为什么我无法获得文内引用或参考文献列表？