\documentclass[doc]{apa}
\usepackage{url}
\usepackage{apacite}
\usepackage{setspace}
\onehalfspacing

\begin{document}

\title{
My Document:\\
\textbf{And its subtitle}
\author{
Joe Bloggs
}
\affiliation{Course: Computer Science}

\rightheader{Short version of title on all pages}

\maketitle

\section{Section Title Here}

\subsection{Sub section title here}

\bibliographystyle{apacite}
\bibliography{references}

\end{document}