It's easy to cite LitCharts for use in academic papers and reports.
Cosby, Matt. "In the Time of the Butterflies." <em>LitCharts.</em> LitCharts LLC, 7 Sep 2014. Web. 16 Jan 2017.
Cosby, Matt. "<em>In the Time of the Butterflies</em>." LitCharts LLC, September 7, 2014. Retrieved January 16, 2017. http://www.litcharts.com/lit/in-the-time-of-the-butterflies.