M. R. Arpentieva, G. K. Kassymova, S. V. Lavrinenko, Z. I. Tyumaseva, G. V. Valeeva, O. B. Kenzhaliyev, M. B. Triyono, O. N. Duvalina, & A. V. Kosov. (2019). ENVIRONMENTAL EDUCATIONIN THE SYSTEM OF GLOBAL AND ADDITIONAL EDUCATION. «Вестник НАН РК», (3), 158–168. извлечено от http://189185.vm7pq.group/bulletin-science/article/view/1474