Dr. Hatta leidt het opbouwoverleg (Munas Pembangunan, 1957)
Dr Hatta leads the development conference (Munas Pembangunan, 1957)
Het Nieuwsblad voor Sumatra (27 Nov 1957, p.1): the National Development Conference chaired by Hatta, attended by Sukarno and Djuanda. Twelve morning speakers; Trimurti of the National Council proposes considering the pre-advice of Sukarno, Hatta and Djuanda after the general debate; others propose committees, national