US Monthly Indonesian Press Survey (1958) extracts: Kowani secretariat (Maria Ulfah Santoso chair, Mudigdio of Gerwani treasurer); Harian Rakjat's 30 Dec 1957 list of Gerwani's working council (Umi Sardjono chair; Mudigdio, Suharti, S.K. Trimurti deputies; Kartinah secretary-general; Sulami deputy; Suwati Sutrimo Sudji
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
Neues Deutschland, 28 October 1964, p. 1: ADN dispatch from Sofia, headed 'Ilse Thiele neue IDFF-Vizepräsidentin'. At the end of the WIDF council session DFD chair Ilse Thiele was elected one of four new vice-presidents; Freda Brown (Australia), Vilma Espín (Cuba) and Umi Sardjono (Indonesia) were confirmed in the post
Tempo.co explainer (29 Sept 2021) on organisations 'considered affiliated' with the PKI: Gerwani, Lekra, SOBSI, Pemuda Rakjat. It states, citing Wieringa, that Gerwis became Gerwani at its 1954 second congress, electing PKI member Umi Sardjono as chair. Short, background-level.