Aldossari, A. T., and M. M. Aldajani. “The Effectiveness of a Self-Questioning Strategy at Developing Academic Achievement and Critical-Thinking Skills Among Secondary-School Students in Saudi Arabia”. International Journal of Learning, Teaching and Educational Research, vol. 20, no. 8, Aug. 2021, pp. 278-99, http://www.ijlter.net/index.php/ijlter/article/view/54.