De Nieuwsgier, 8 Sept 1951: Moh. Tabrani, B.M. Diah and Mrs Trimurti 'of the Gerwis' accept an invitation to Beijing for the second anniversary of the People's Republic on 1 Oct; Ki Hadjar Dewantara and another educator were also invited. Records S.K. Trimurti's Gerwis affiliation and a 1951 invitation to China.
Whole page, Java-Bode, 8 Sep 1951 (columns interleaved, some English items). The only Gerwis-relevant article reports that the Chinese government invited B.M. Diah, Tabrani, Ki Hadjar Dewantara, Zachai and Mrs Trimurti of Gerwis to the PRC's second anniversary celebrations in Peking; Trimurti accepted.
Ipong Jazimah's 2016 biographical sketch of S.K. Trimurti (1912-2008): journalist, labour minister, Gerwis co-founder, Petisi 50 signatory. Pages 50-51 cover Gerwis's founding; relies on a few secondary sources.