Kodliuk, Yaroslava P., and Iryna I. Chekriy. “ELABORATION AND CREATION OF ELECTRONIC TEXTBOOKS FOR GENERAL SECONDARY EDUCATIONAL INSTITUTIONS (BASED ON UNESCO MATERIALS)”. Information Technologies and Learning Tools, vol. 81, no. 1, Feb. 2021, pp. 46-59, https://doi.org/10.33407/itlt.v81i1.3495.