The Life of Alexander Pope, by Robert Carruthers, 1857, with a corrupted and badly scanned version available from Internet Archive, or as an even worse 23MB PDF. For reference to his relationship with Martha Blount and her sister, see pp. 64–68 (p. 89 ff. of the PDF). In particular, discussion of the controversy over whether the relationship was sexual is described in some detail on pp. 76–78.
Clegg, Gillian. "Chiswick History". People: Alexander Pope. chiswickhistory.org.uk. Archived from the original on 20 September 2011. Retrieved 16 March 2012.
doi.org
Erskine-Hill, Howard (2004). "Pope, Alexander (1688–1744)", Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/22526 (subscription required)
James Sambrook (2004) "Thurston, Josephlocked (1704–1732)", Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/70938
"Personhood, Poethood, and Pope: Johnson's Life of Pope and the Search for the Man Behind the Author" by Mannheimer, Katherine. Eighteenth-Century Studies - Volume 40, Number 4, Summer 2007, pp. 631-649 MUSEArchived 3 March 2016 at the Wayback Machine
"Martha Blount". Encyclopædia Britannica. 2009. Archived from the original on 30 January 2012. Retrieved 17 April 2009.
Clegg, Gillian. "Chiswick History". People: Alexander Pope. chiswickhistory.org.uk. Archived from the original on 20 September 2011. Retrieved 16 March 2012.
"Personhood, Poethood, and Pope: Johnson's Life of Pope and the Search for the Man Behind the Author" by Mannheimer, Katherine. Eighteenth-Century Studies - Volume 40, Number 4, Summer 2007, pp. 631-649 MUSEArchived 3 March 2016 at the Wayback Machine