Dr. Ch. Evy Tri Widyahening, and Drs. AR. Koesdyantho. “The Struggle of Frederick Douglass to Get His Freedom As Seen in the Narrative of the Life of Frederick Douglass: An American Slave (A Psychological Approach)”. Researchers World - International Refereed Social Sciences Journal 9, no. 2 (August 18, 2021): 152–158. Accessed July 14, 2025. https://researchersworld.com/index.php/rworld/article/view/104.