1. Andersen, L. (2014). Visual-spatial ability: Important in STEM, ignored in gifted education. Roeper Review, 36(2), 114–121.
2. Bakker, M. (2008). Spatial ability in primary school: Effects of the Tridio® learning material, Master thesis of psychology. University of Twente, Enschede.
3. Bell, D. (2016). The reality of STEM education, design and technology teachers’ perceptions: A phenomenographic study. International Journal of Technology and Design Education, 26, 61–79.
4. Bennet, G. (2008). Bennett mechanical comprehension test. San Antonio: Pearson.
5. Board, N. S. (2010). Preparing the next generation of STEM innovators: Identifying and developing our nation’s human capital. Washington: National Science Foundation.