It's easy to cite LitCharts for use in academic papers and reports.
MLA
Mauriello, Mark. "American Psycho." LitCharts. LitCharts LLC, 13 Mar 2017. Web. 15 Apr 2021.
Chicago
Mauriello, Mark. "American Psycho." LitCharts LLC, March 13, 2017. Retrieved April 15, 2021. https://www.litcharts.com/lit/american-psycho.