Prasolova-Forland, Ekaterina, and Theodor Wyeld. “The Place Metaphor in 3D CVEs: A Pedagogical Case Study of the Virtual Stage”. International Journal of Emerging Technologies in Learning (iJET) 3, no. 1 (December 10, 2007). Accessed May 16, 2022. https://online-journals.org/index.php/i-jet/article/view/194.