Hutahaen, David Togi, and Christian Neni Purba. “Peningkatan Kompetensi Guru Melalui Penulisan Buku Ajar”. SAMBARA: Jurnal Pengabdian Kepada Masyarakat 4, no. 2 (May 31, 2026): 535–542. Accessed June 10, 2026. http://www.putrapublisher.org/index.php/sambara/article/view/1763.