Sinaga, I. and Ramadani, R. (2023) “Supervision of the National Standardization Agency (BSN) Related to the Rising Circulation of Helmet that Does not Accept the Indonesian National Standard (SNI) Case Study in Medan City”, Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), 6(3), pp. 2649-2659. doi: 10.31538/iijse.v6i3.3988.