Il’chenko О. Г. . TEXTBOOKS OF NATURAL CYCLE AS A COMPONENT OF THE RESEARCH EDUCATIONAL ENVIRONMENT. Problems of the modern textbook, [S. l.], n. 14, p. 214–221, 2014. Disponível em: https://ipvid.org.ua/index.php/psp/article/view/538. Acesso em: 22 jul. 2024.