Alief Iskurniawan, M., S. Sugiharto, and S. Baitul Mukarromah. “The Development of Virtual Reality-Based Basketball Arbitration Simulation Tools”. Journal of Physical Education and Sports, Vol. 9, no. 2, Apr. 2020, pp. 159-65, http://journal.unnes.ac.id/sju/jpes/article/view/40834.