Muslem Hamood al-Yaqoubi. “Developing Social Studies Textbooks for the Ninth and Tenth Grades in the Sultanate of Oman in the Light of Recent Global Trends: (Environmental Education Portal) (Reality - Problems - Development Trends)”. Journal of Arts, Literature, Humanities and Social Sciences, no. 54, July 2020, pp. 345-61, doi:10.33193/JALHSS.54.2020.143.