Piatnytskova, I. . “Memories of M. P. Ballina, M. V. Levytskoho, V. S. Nahirnoho about the Cooperative Movement of Ukraine in the Second Half of the 19th - the Beginning of the 20th Century”. Ukrainian Peasant, no. 25, June 2021, doi:10.31651/2413-8142-2021-25-Piatnytskova.