Valentina Lumban Gaol, Theresia, dan Romeiza Syafriharti. “The Factor of Using Motorcycle for Work”. International Journal of Regional Planning 1 (Maret 1, 2024): 7-14. Diakses Juli 22, 2024. https://ojs.unikom.ac.id/index.php/injurplan/article/view/5561.