F.O. Haqqiyeva. “ANALYSIS OF THE CONTENT AND DEVELOPMENT TRENDS OF THE PRESCHOOL EDUCATION SYSTEM IN DEVELOPED COUNTRIES”. PORTUGAL-SCIENTIFIC REVIEW OF THE PROBLEMS AND PROSPECTS OF MODERN SCIENCE AND EDUCATION 1, no. 7 (September 26, 2025): 14–17. Accessed May 15, 2026. https://e-conferences.org/index.php/portugal/article/view/394.