It's easy to cite LitCharts for use in academic papers and reports.
MLA
Wilson, Joshua. "Adventures of Huckleberry Finn." LitCharts. LitCharts LLC, 19 Sep 2013. Web. 6 Mar 2021.
Chicago
Wilson, Joshua. "Adventures of Huckleberry Finn." LitCharts LLC, September 19, 2013. Retrieved March 6, 2021. https://www.litcharts.com/lit/the-adventures-of-huckleberry-finn.