N. A. Busabaa and N. A. Ateeg, “A Content Analysis of Modals in Action Pack Ten, Eleven, Twelve in Terms of Variety in Meaning, Distribution, and Activities: Recommendations for Effective Methods in Teaching Modals: Recommendations for Effective Methods in Teaching Modals”, JER, vol. 5, no. 1, pp. 24–36, Jun. 2020.