BUSEL-KUCHYNSKAYA Е. “THE ESTABLISHMENT OF THE SOVIET SYSTEM OF PRESCHOOL EDUCATION IN LANDS OF RUSSIAN-BELARUSIAN BORDER 1917–1924 (ON MATERIALS OF VITEBSK REGION)”. Vestnik of Polotsk State University. Part E. Pedagogic Sciences, no. 7, Aug. 2018, pp. 8-13, https://journals.psu.by/pedagogical/article/view/43.