Drigas, Athanasios, and Eleni Mitsea. “8 Pillars X 8 Layers Model of Metacognition: Educational Strategies, Exercises &Trainings”. International Journal of Online and Biomedical Engineering (iJOE), vol. 17, no. 08, Aug. 2021, pp. pp. 115-134, doi:10.3991/ijoe.v17i08.23563.