Xasanboy Doniyorbek oʻgʻli, Abdumutalov. “SANGINA, PASTEL MATERIALLARIDAN FOYDALANISH”. Scientific Impulse 1, no. 3 (November 1, 2022): 39–43. Accessed March 22, 2025. http://nauchniyimpuls.ru/index.php/ni/article/view/830.