Grofman, Bernard. “Pig and Proletariat: Animal Farm as History.” Short Story Criticism, edited by Joseph Palmisano, vol. 68, Gale, 2004
Orwell, George. Animal Farm. 1945.
“Purge Trials.” Encyclopedia Britannica. https://www.britannica.com/event/purge-trials
Robb, Paul H. “Animal Farm: Overview.” Reference Guide to English Literature, edited by D. L. Kirkpatrick, 2nd ed., St. James Press, 1991
“The Show Trials of the USSR.” https://www.historylearningsite.co.uk/modern-world-history-1918-to-1980/russia-1900-to-1939/the-show-trials-in-the-ussr/
Snodgrass, Mary Ellen. “Animal Farm.” Children’s Literature Review, edited by Tom Burns, vol. 132, Gale, 2008
“Stalin Banishes Trotsky.” https://www.history.com/this-day-in-history/stalin-banishes-trotsky