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2. Westfall, R.S.: Never at Rest. Cambridge University Press (1980, 1998). ISBN 0-521-27435-4
3. Westfall, R.S.: Isaac Newton. Cambridge University Press (2007). ISBN 978-0-19-921355-9
4. More, L.T.: Isaac Newton A Biography 1642-1727. pp. 246, 381, and 389. Scribners, New York (1934)
5. Voltaire, F.M.A: Cassell & Co. In: Price, D., (ed.) Letters on England. p. 100. (1894). Also available in pdf form
http://livros.universia.com.br/?dl_name=Letters-on-England-de-Voltaire.pdf