aditya, joni. “Prototype Sistem Kendali Keamanan Perlintasan Kereta Otomatis Menggunakan Gps Neo 6m”. JOURNAL ZETROEM 4, no. 2 (October 23, 2022): 7–10. Accessed July 17, 2025. https://ejournal.unibabwi.ac.id/index.php/Zetroem/article/view/2120.