Putri, Rizka Cahyaning Arifin. “From KNIP Building to Sarinah Mall Building: Societeit Concordia in Malang City 1900-1970”. Jurnal Sejarah Dan Budaya 15, no. 1 (November 8, 2025). Diakses April 26, 2026. https://archive.p5i.org/index.php/walasuji/article/view/80.