NGUYEN, Thi Ngoc Bich; NGUYEN, Minh Giang; NGUYEN, Thi Yen Thanh. INTEGRATING EDUCATION FOR SUSTAINABLE DEVELOPMENT INTO THE “EARTH AND SKY” THEME IN GRADE 2 NATURAL SCIENCES AND SOCIAL STUDIES: A PROJECT-BASED LEARNING APPROACH. Ho Chi Minh City University of Education Journal of Science, [S. l.], v. 22, n. 5, p. 838–849, 2025. DOI: 10.54607/hcmue.js.22.5.4263(2025). Disponível em: https://journal.hcmue.edu.vn/index.php/hcmuejos/article/view/4263. Acesso em: 10 feb. 2026.