Khasanova Gulnoz Kasimovnа, Nigmatova Mavjuda Mahmudovna. “Classification of Educational Activities and Assessment Classifications: Improvement of Pedagogical Problems”. International Journal of Advanced Science and Technology, Vol. 29, no. 11s, June 2020, pp. 1958 -61, http://sersc.org/journals/index.php/IJAST/article/view/21861.