Shertaylaqov G‘.M., and Ziyodullayeva O`.M. “KATTALIKLAR QIYMATINING ANIQLASH JARAYONINING BAJARILISHI”. World Scientific Research Journal, vol. 2, no. 2, May 2022, pp. 39-44, http://wsrjournal.com/index.php/wsrj/article/view/71.