Sirochev , M. B. “‘TOVAR VA TRANSPORT VOSITALARINING BOJXONA QIYMATINI ANIQLASHNING OʻZIGA XOS XUSUSIYATLARI’”. Educational Research in Universal Sciences, vol. 2, no. 17 SPECIAL, Dec. 2023, pp. 930-4, http://erus.uz/index.php/er/article/view/5328.