Ebner, Martin, and Stefan Lexow. “Development of a Collaborative Learning Game Using External Plastic Cards As an Input Device on an IPad”. International Journal of Interactive Mobile Technologies (iJIM) 8, no. 2 (April 5, 2014): pp. 10–14. Accessed November 22, 2024. https://online-journals.org/index.php/i-jim/article/view/3543.