It's easy to cite LitCharts for use in academic papers and reports.
MLA
Fredericksen, Erik. "Grendel." LitCharts. LitCharts LLC, 16 Sep 2013. Web. 4 Jul 2020.
Chicago
Fredericksen, Erik. "Grendel." LitCharts LLC, September 16, 2013. Retrieved July 4, 2020. https://www.litcharts.com/lit/grendel.