Kudadiri, Olihta, Rahmatsyah, Rita Juliani, Juniar Hutahean, Muhammad Kadri, and Togi Tampubolon. “Study of the Existence of the Toba Pyramid Site in Marbun Toruan Village Using a Combination of Geoelectric and Satellite Imagery Methods”. Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 15, no. 2 (December 30, 2025): 159–174. Accessed August 6, 2026. https://journal.unesa.ac.id/index.php/jpfa/article/view/34569.