Kangas, K., P. Seitamaa-Hakkarainen, and K. Hakkarainen. “Design Thinking in Elementary Students’ Collaborative Lamp Designing Process”. Design and Technology Education: An International Journal, vol. 18, no. 1, Mar. 2013, pp. 30-43, https://openjournals.ljmu.ac.uk/DesignTechnologyEducation/article/view/1662.