Abduvaliyev , D. B. o‘g‘li, D. O. o‘g‘li Mahmudov, and S. I. o‘g‘li Sayfullayev. “RAQOBATNING MAZMUNI VA SHAKLLARI”. Educational Research in Universal Sciences, vol. 2, no. 4 SPECIAL, June 2023, pp. 1142-4, http://erus.uz/index.php/er/article/view/3030.