Karar, Piu, Mousumi Chatterjee, Sourav Deshi, Megha Das, Prity Das, and Sayak Pal. 2021. “Cost Estimation and Fabrication of Automatic Hand Sanitizing Machine”. International Journal of Research in Engineering, Science and Management 4 (5): 24-27. https://journal.ijresm.com/index.php/ijresm/article/view/714.