Al Jabri, M. J. H. ., H. . Silvennoinen, and D. . Griffiths. “Teachers’ Professional Development in Oman: Challenges, Efforts and Solutions”. International Journal of Learning, Teaching and Educational Research, vol. 17, no. 5, May 2019, pp. 82-103, http://www.ijlter.net/index.php/ijlter/article/view/678.