Suwigtyo, Rey, Marjono Marjono, Andi Kurniawan, und Fadillah Putra. Development of Environmentally Friendly Transportation in the City of Probolinggo. International Journal of Social Science Research and Review 5, no. 10 (Oktober 7, 2022): 530-538. Zugegriffen Mai 20, 2024. https://ijssrr.com/journal/article/view/750.