Commemoration of 1 May 1951 in Surakarta (Bentara)
Full-page notice in the Surakarta magazine Bentara listing the organising committee of the 1 May 1951 Labour Day commemoration, a left united front dominated by SOBSI unions and including Gerwis.
Lecture on women (Maria Ulfah; S.K. Trimurti mentioned), Tempo, 26 Feb 1977
Tempo item (26 February 1977) profiling Maria Ulfah, who advises working women on labour rights and the marriage law and speaks against polygamy. It says she works with 'dra. SK Trimurti' in the Yayasan Tenaga Kerja Indonesia (YTKI) on women workers' workshops, seminars and legal information. Trimurti, a Gerwis founder