ALI, Z.; AFZAL, K.; WASSAN, M. R. Environmental Education and Sustainable Development: A Qualitative Content Analysis of Textbooks in the Schools of Islamabad. Progressive Research Journal of Arts & Humanities (PRJAH), London, UK, v. 8, n. 1, p. 85–95, 2025. DOI: 10.51872/prjah.vol7.Iss2.469. Disponível em: https://prjah.org/index.php/prjah/article/view/469. Acesso em: 2 aug. 2026.