Pewarta Soerabaia, 21 November 1957, hlm. 4: Gedung Concordia Malang
Pewarta Soerabaia, 21 November 1957: Concordia building, Malang
Pewarta Soerabaia, 21 Nov 1957, p. 4: Malang municipality orders six organisations including BTI and Gerwani (Malang regency branch) to vacate the ruins of the former Societeit Concordia within seven days.