Sianturi, D. R.; Rajagukguk, D.; Christopel Tambunan; Bella Simanjuntak; Patar Nababan; Robinhot Sihombing. Implementation of Christian Ethical Values for HKI Seisemayang Medan Special Resort Sunday School Children through the Cheerful Sunday Method by IAKN Tarutung Students. AJPR 2024, 3, 29-44.