Saprudin, S., L. Liliasari, A. S. Prihatmanto, A. Setiawan, and F. Hamid. “The Design of OpticalGamification (OG) With Random Model in Learning Interference and Diffraction”. Momentum: Physics Education Journal, vol. 5, no. 1, Jan. 2021, pp. 29-42, doi:10.21067/mpej.v5i1.4889.