Yusupova Umida, Shodiyeva Kuxinur, and Boboqulova Oydin. “INGLIZ TILINI BILISH TO`GRISIDAGI MILLIY YOKI XALQARO SERTIFIKAT OLISH UCHUN TAVSIYALAR”. Ta’lim Innovatsiyasi Va Integratsiyasi, vol. 11, no. 4, Dec. 2023, pp. 102-4, https://web-journal.ru/ilmiy/article/view/2235.