there's a heading with elsarticle, and also with your code. It required that bibliography entries exist, otherwise there's no bibliography and no heading.
So ensure that there are entries.
If there are still problems, post a real

Stefan
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The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
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Code: Select all
\documentclass[12pt,a4paper,titlepage]{article}
\usepackage{amsmath}
\usepackage{amscd}
\usepackage{amsfonts}
\usepackage{inputenc}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{lmodern}
\usepackage[english]{babel}
\usepackage{apacite}
\usepackage[round]{natbib}
\usepackage{hyperref}
\usepackage[all]{hypcap}
\hypersetup{
colorlinks=false,
linkcolor=blue,
filecolor=magenta,
urlcolor=cyan,
}
\urlstyle{same}
\begin{document}
\title{}
\author{,\footnote{}}
\maketitle
\begin{abstract}
\textbf{Key Words:}
\end{abstract}
\section{Introduction}
\section{Conclusion}
\bibliographystyle{apacite}
\bibliography{stability}
\end{document}
Learn LaTeX easily with newest books:
The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
The LaTeX Cookbook: 2nd edition full of practical examples for mathematics, physics, chemistry, and more
LaTeX Graphics with TikZ: the first book about TikZ for perfect drawings in your LaTeX thesis