Mulyadi, Eko. “Development of Photoelectric Effect Learning Media on Physics Learning at Vocational High Schools”. Ideguru: Jurnal Karya Ilmiah Guru 7, no. 2 (May 1, 2022): 206-211. Accessed July 6, 2022. https://jurnal-dikpora.jogjaprov.go.id/index.php/jurnalideguru/article/view/361.