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\usepackage{graphicx}
\graphicspath{ {images/} }


\begin{figure}[h]
    \caption{caption}
    \includegraphics[width=\textwidth]{filename}
\end{figure}

\usepackage{biblatex}
\addbibresource{ref.bib}


%in text:
\cite{reference}


\printbibliography

\documentclass[a4paper]{article}

\begin{document}
\title{Title}
\author{Simon Nilsson}
\date{Februari 2018}
\maketitle

\end{document}