Manik, Charla Tri Selda. “Tool Demonstration Lamp Gravity (Gravity Lights)”.
Journal of Science Technology (JoSTec)
1, no. 1 (December 29, 2019): 15–20. Accessed January 1, 2025. https://ejournal.ipinternasional.com/index.php/jostec/article/view/47.