R.A.Nasimov. “SOLIQ YUKINI OPTIMALLASHTIRISH VA TAKOMILLASHTIRISHDA OLIMLARNI FIKIRI”. Ustozlar uchun 16, no. 1 (March 24, 2023): 48–53. Accessed September 19, 2024. http://pedagoglar.uz/index.php/01/article/view/3405.