CIA intelligence survey of the PKI's history, structure and front organisations, May 1955, before the September 1955 elections. Section III.E (report pp. 49-50) profiles Gerwani: founded 1950 as Gerwis, renamed Gerwani at the March 1954 congress, 25,000+ members, S.K. Trimurti general chairman and Umi Sardjono chairman
C. van Dijk, Rebellion under the Banner of Islam: The Darul Islam in Indonesia (KITLV/Martinus Nijhoff, 1981), a political history of the Darul Islam risings in West and Central Java, South Sulawesi, South Kalimantan and Aceh, and of why people joined them. It never mentions Gerwani. Its relevance is biographical: Mrs
English edition of Tempo's 'The Feminist in Two Councils' (4 Oct 2021, Hussein Abri) on Umi Sardjono as legislator (Constituent Assembly 1955, DPR-GR 1959-65). It covers her immigration reform, marriage-bill push (minimum age 21, ban on polygamy, Maisuri case, 115 harmful marriages) opposed by Kowani's Islamic groups,