Kuysin Tukhtaeva,Karima Karaeva,Surayyo Saidova,Zarifa Ibragimova,Mokhira Djuraeva. “MAIN PECULIARITIES OF TEACHING EFL IN MIXED-ABILITY GROUPS”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, Apr. 2020, pp. 1712 -15, http://sersc.org/journals/index.php/IJAST/article/view/10204.