Yo‘ldashev Axrorjon, and Tojiddinova Muqaddasxon. “MAKTABGACHA TA’LIM TARIXI VA FRIDRIX FREBEL YONDASHUVI”. Kokand University Research Base, Apr. 2024, pp. 650-2, https://scholar.kokanduni.uz/index.php/rb/article/view/181.