Physicians and Irregular Medical Practitioners in London 1550-1640 Database. Originally published by Centre for Metropolitan History, London, 2004.
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Margaret Pelling, Frances White, 'DE NICHOLAS, Johannes', in Physicians and Irregular Medical Practitioners in London 1550-1640 Database( London, 2004), British History Online https://prod.british-history.ac.uk/no-series/london-physicians/1550-1640/de-nicholas-johannes [accessed 21 November 2024].
Margaret Pelling, Frances White, 'DE NICHOLAS, Johannes', in Physicians and Irregular Medical Practitioners in London 1550-1640 Database( London, 2004), British History Online, accessed November 21, 2024, https://prod.british-history.ac.uk/no-series/london-physicians/1550-1640/de-nicholas-johannes.
Margaret Pelling, Frances White. "DE NICHOLAS, Johannes". Physicians and Irregular Medical Practitioners in London 1550-1640 Database. (London, 2004), , British History Online. Web. 21 November 2024. https://prod.british-history.ac.uk/no-series/london-physicians/1550-1640/de-nicholas-johannes.