GYULEMETOVA, M. Option of training for sustainable development and environment througt examples of problem – situation methods. Annual of Natural Sciences Department, [S. l.], v. 5, p. 67–73, 2021. DOI: 10.33919/ansd.19.1.7. Disponível em: https://ojs.nbu.bg/index.php/ANSD/article/view/509. Acesso em: 26 apr. 2024.