\documentclass[a4paper, 12pt]{article}
\usepackage{comment} % enables the use of multi-line comments (\ifx \fi)
\usepackage{lipsum} %This package just generates Lorem Ipsum filler text.
\usepackage{graphicx}
\usepackage{fullpage} % changes the margin
\usepackage{natbib}
\bibliographystyle{abbrvnat}
\setcitestyle{authoryear,open={(},close={)}}
\begin{document}
%Update this information!!!!
\noindent
\large\textbf{Discussion Essay} \\
\normalsize P.-Y. Lu, Y.-Y. Chang, and S.-K. Hsieh. Causing emotion in collocation: An exploratory data analysis. In Proceedings of the 25th Conference on Computational Linguistics and Speech Processing (ROCLING 2013), pages 236---249, 2013.
\\ \\
\textbf{Firstname Lastname} \\
\normalsize Due Date: 15/01/2019
\section*{Introduction}
\lipsum[1]
\section*{Theoretical background}
\lipsum[2]
% This is how you cite
\cite{lu2013causing}
%=============================================
\bibliographystyle{acl}
\bibliography{Cites.bib}
\end{document}
\ifx
Comments!
\fi
% ===========
\ifx
%==============
% References if you want it manual
% \bibitem{Robotics} Fred G. Martin \emph{Robotics Explorations: A Hands-On Introduction to Engineering}. New Jersey: Prentice Hall.
% \bibitem{Flueck} Flueck, Alexander J. 2005. \emph{ECE 100}[online]. Chicago: Illinois Institute of Technology, Electrical and Computer Engineering Department, 2005 [cited 30
% August 2005]. Available from World Wide Web: (http://www.ece.iit.edu/~flueck/ece100).
