Murad, Sharefa, Ignazio Passero, Rita Francese, and Genoveffa Tortora. “An Empirical Evaluation of Technical Drawing Didactic in Virtual Worlds”. International Journal of Online and Biomedical Engineering (iJOE) 7, no. S1 (September 18, 2011): pp. 23–30. Accessed May 5, 2024. https://online-journals.org/index.php/i-joe/article/view/1733.