Doyan, Aris, and Rika Ratnasari. “Simple Periscope Design As Optical Learning Media”. AMPLITUDO : Journal of Science and Technology Innovation 1, no. 2 (August 31, 2022): 75–78. Accessed October 22, 2024. https://journals.balaipublikasi.id/index.php/amplitudo/article/view/19.