Kručena, Amalda Margita, and Gundega Bēriņa. “E-BOOKS”. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, no. 24 (April 22, 2020): 59–63. Accessed May 1, 2024. https://journals.ru.lv/index.php/HET/article/view/6751.