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home page of Royal Society of South Africa web site
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«Hendrik Frensch Verwoerd». South African History Online. Consultado el 9 de marzo de 2013. «On 5 October 1960 a referendum was held in which White voters were asked "Do you support a republic for the Union?" — 52 percent voted 'Yes'.»
YOUR VOTE IS VITAL, Various Referendum campaign posters for and against becoming a republic 1960, University of South Africa Institutional Repository, 17 May 2013