Yrjönsuuri, V., K. Kangas, K. Hakkarainen, and P. Seitamaa-Hakkarainen. “The Roles of Material Prototyping in Collaborative Design Process at an Elementary School”. Design and Technology Education: An International Journal, vol. 24, no. 2, July 2019, pp. 141-62, https://openjournals.ljmu.ac.uk/DesignTechnologyEducation/article/view/1315.