It's easy to cite LitCharts for use in academic papers and reports.
Smith, Rosa. "The Absolutely True Diary of a Part-Time Indian." <em>LitCharts.</em> LitCharts LLC, 18 Sep 2015. Web. 23 Sep 2017.
Smith, Rosa. "<em>The Absolutely True Diary of a Part-Time Indian</em>." LitCharts LLC, September 18, 2015. Retrieved September 23, 2017. http://www.litcharts.com/lit/the-absolutely-true-diary-of-a-part-time-indian.