It's easy to cite LitCharts for use in academic papers and reports.
MLA
Houghton, Eve. "Diary of a Wimpy Kid." LitCharts. LitCharts LLC, 31 Jul 2018. Web. 21 Sep 2020.
Chicago
Houghton, Eve. "Diary of a Wimpy Kid." LitCharts LLC, July 31, 2018. Retrieved September 21, 2020. https://www.litcharts.com/lit/diary-of-a-wimpy-kid.