%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Helland1987} Helland, I. S. (1987). \textit{On the Interpretation and Use of R2 in Regression Analysis} (Vol. 43).

\end{thebibliography}

\end{document}

