A. Saydah, F. Z. Fakhruddin Z, M. Irianti, and M. N. M. Nor, “Validity Test and Practicality Test of Virtual Reality Based Learning Media on Optical Equipment Material”, JES, vol. 8, no. 3, pp. 476–487, Jul. 2024, doi: 10.31258/jes.8.3.p.476-487.