%&LaTeX
\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Firmansyah_etal2021} {\textquotedblleft}\textit{An integrated assessment of environmental, economic, social and technological parameters of source separated and conventional sanitation concepts : a contribution to sustainability analysis}{\textquotedblright}. Firmansyah I, Carsjens GJ, de Ruijter FJ, Zeeman G, Spiller M, Journal Of Environmental Management \textbf{295}, 113131 (2021).   http://doi.org/10.1016/J.JENVMAN.2021.113131

\end{thebibliography}

\end{document}

