Uygan, C., and G. Bozkurt. “GeoGebra-Based Scaffolding of a Prospective Mathematics Teacher’s Learning While Exploring the Properties of Chord and Tangent in Circle”. Journal of Qualitative Research in Education, vol. 7, no. 4, Oct. 2019, doi:10.14689/Issn.2148-2624.1.7c.4s.15m.