Situmorang, Eduward, Monica Angelika Silitonga, Cindi Yarti Simanjuntak, Merlin Margaretha Boangmanalu, Rina Pefrianti Putri Sinaga, and Anakki Augusterodin Simanjuntak. “Pengaruh Ibadah Pagi Terhadap Efektivitas Belajar Siswa SMA YP HKBP 1”. Jurnal Penelitian Ilmu Pendidikan Indonesia 5, no. 1 (February 25, 2026): 644–648. Accessed June 18, 2026. https://jpion.org/index.php/jpi/article/view/1043.