Straits Times, 8 Aug 1955, by P. A. van der Poel (lead only). Describes how the Communist organisation is preparing for the 1955 Indonesian elections, winning support through sport, religion and an appeal to 'non-party' people. Matched on Umi Sardjono; lead does not name her.
Seven-page Ministry of Information file of short official biographies; only the first concerns Gerwani: parliamentary member no. 86 Umi Sardjono (b. Salatiga 1923, PKI list for East Java), with her career from Semarang telephone office to Kediri and Gerwani.
De Nieuwsgier report (16 Nov 1956) on parliament adopting the Anwar Harjono resolution regretting Soviet interference in Hungary (102 for, 29 against, PKI etc.) and an amended Adam Malik motion (71 for) on UN troop withdrawals. Umi Sardjono is listed among the Malik motion's co-submitters (Pembangunan).
Bintang Merah special issue, vol. 1: documents of the VI National Congress of the PKI, Jakarta 7-14 September 1959 (Yayasan Pembaruan, 1960). Contains Aidit's opening speech, the Central Committee's General Report, and Programme and Constitution changes. Gerwani is not named; on women it records growing women's members
Historia article (2019) on women's wings of parties in the 1955 election (Perwamu, Parkiwa, Wanita Demokrat, Aisyiyah, Bhayangkari), noting the PKI grew close to Gerwani and that Mudigdio and Umi Sardjono entered the DPR for the PKI. Context on Gerwani and elections.