Saprudin, S., Liliasari, L., Prihatmanto, A. S., Setiawan, A. and Hamid, F. (2021) “The design of OpticalGamification (OG) with random model in learning interference and diffraction”, Momentum: Physics Education Journal, 5(1), pp. 29-42. doi: 10.21067/mpej.v5i1.4889.