Kryvonos О. М., Mosiuk О. О., and Kryvonos М. П. “An Overview of the Functionality of the Online Image Editor Pixlr As a Tool for Training Teachers of Informatics”. Scientific Journal of the Mykhailo Dragomanov Ukrainian State University. Series 2. Computer-Oriented Learning Systems, no. 19 (26), May 2019, pp. 163-70, https://sj.udu.edu.ua/index.php/kosn/article/view/30.