Abadi, 31 Juli 1951, hlm. 1: Dua panitia 17 Agustus di Yogya
Abadi, 31 July 1951, p. 1: Two 17 August Committees in Yogya
Abadi, 31 July 1951, p. 1: Aneta report that SOBSI and left groups including Gerwis formed a separate 17 August committee in Yogyakarta, denouncing the municipal committee as undemocratic.