* Westfall, Richard S. ''Never at Rest: A Biography of Isaac Newton'' (1983), 928pp [http://www.amazon.com/gp/reader/0521274354/ref=sib_dp_pt#reader-link excerpt and text search], the standard scholarly biography
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** Westfall, Richard S. ''The Life of Isaac Newton'' (1994), 350pp; abridged version [http://www.amazon.com/gp/reader/0521477379/ref=sib_dp_pt#reader-link excerpt and text search]