Mulyahani, A., I. Ibrahim, and Y. S. Saragih. “Sistem Buka Tutup Pintu Otomatis Dengan Sensor Ultrasonik”. Jurnal Ilmiah Wahana Pendidikan, Vol. 9, no. 23, Dec. 2023, pp. 126-34, https://jurnal.peneliti.net/index.php/JIWP/article/view/5478.