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, vol. 1, no. 7, Sept. 2025, pp. 14-17, https://e-conferences.org/index.php/portugal/article/view/394.