Nurmala, Siti, dan Argi Arafat. “Sistem Pertahanan Berlapis Benteng Willem I Ambarawa”. JANUS 2, no. 1 (Juni 3, 2024): 27-45. Diakses Juli 18, 2024. https://jurnal.ugm.ac.id/v3/janus/article/view/12396.