Nurmala, Siti, and Argi Arafat. “Sistem Pertahanan Berlapis Benteng Willem I Ambarawa”. JANUS 2, no. 1 (June 3, 2024): 27-45. Accessed November 22, 2024. https://dev.journal.ugm.ac.id/v3/janus/article/view/12396.