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. 7, n. 2, p. 85–95, 2025. DOI: 10.51872/prjah.vol7.Iss2.469. Disponível em: http://prjah.org/index.php/prjah/article/view/469. Acesso em: 16 jun. 2026.