Dimla, R. B., and D. M. Soriano. “Integration of Spatial Visualization Tasks to Enhance Students’ Levels of Geometric Thinking Following the Van Hiele Model: A Basis for the Development of a Definitive Guide in Geometry”. Religación, Vol. 4, no. 17, July 2019, pp. 311-20, https://revista.religacion.com/index.php/religacion/article/view/903.