Filatov, B. S. “The Crisis in the Sumy Branch of the CPU (1990–1991 Rr.)”. Literature and Culture of Polissya 92, no. 10i (November 24, 2018): 274-281. Accessed April 5, 2020. http://lkp.ndu.edu.ua/index.php/polissia/article/view/98.