Algemeen Indisch Dagblad (1952-01-18, p. 3): in Surabaya a Panitya Pembebasan Irian Barat is formed at the initiative of the Badan Perdjoangan Irian Timur Jawa with SOBSI, PKI, PNI, Murba and others; Gerwis sits in the organisation section with youth fronts. It seeks to end the RTC agreement and abolish the Union.
De Nieuwsgier, 6 Dec 1952: representatives of 18 parties and organisations in Surabaya, under the PNI, urge the government to clarify whether the 17 October 1952 affair was a coup, to act against all involved and to implement the Sophiaan motion. Gerwis is among the listed attendees (with PKI, PNI, SOBSI, Murba, Wanita
UK Foreign Office file FO 371/180312 (1965), 'Internal political situation, Attempted coup against Sukarno [3]', a volume of Embassy letters and telegrams from Djakarta (Ambassador Gilchrist, S.J.G. Cambridge), February to April 1965. It includes Gilchrist's character notes on Subandrio, Aidit and the generals, the tak