Zascerinska, Jelena, Ludmila Aļeksejeva, Mihails Zascerinskis, Olga Gukovica, y Anastasija Aleksejeva. «THE IMPACT OF COVID-19 ON THE IMPROVEMENT OF TEACHING SKILLS ON PROBLEM-BASED LEARNING (PBL)». International Journal for 21st Century Education 7, no. 1 (febrero 9, 2021): 42–59. Accedido noviembre 21, 2024. https://journals.uco.es/ij21ce/article/view/13074.