Lumban Gaol, Sahat Patar, et al. “A Synthesis of the ADDIE Model and Pustekkom: Development of the ‘SAHAT’ Interactive Multimedia Tool for Christian Religious Education in Elementary Schools”. FIKROTUNA: Jurnal Pendidikan Dan Manajemen Islam, vol. 15, no. 02, June 2026, pp. 737-62, doi:10.32806/jf.v15i02.2295.