Ranscombe, C., and K. Bissett-Johnson. “Digital Sketch Modelling: Integrating Digital Sketching As a Transition Between Sketching and CAD in Industrial Design Education”. Design and Technology Education: An International Journal, vol. 22, no. 1, May 2017, pp. 1-15, https://openjournals.ljmu.ac.uk/DATE/article/view/1567.