Situmorang E, Silitonga MA, Simanjuntak CY, Boangmanalu MM, Sinaga RPP, Simanjuntak AA. Pengaruh Ibadah Pagi terhadap Efektivitas Belajar Siswa SMA YP HKBP 1. JPION [Internet]. 2026 Feb. 25 [cited 2026 Aug. 18];5(1):644-8. Available from: https://jpion.org/jpion.org/index.php/jpi/article/view/1043