It's easy to cite LitCharts for use in academic papers and reports.
Smith, Rosa. "The Secret Life of Walter Mitty." <em>LitCharts.</em> LitCharts LLC, 17 Jun 2015. Web. 20 Jan 2017.
Smith, Rosa. "<em>The Secret Life of Walter Mitty</em>." LitCharts LLC, June 17, 2015. Retrieved January 20, 2017. http://www.litcharts.com/lit/the-secret-life-of-walter-mitty.