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*[http://www.archive.org/stream/dictionaryofindi00buckuoft#page/315/mode/1up John Nicholson] ''Dictionary of Indian Biography'' (1906)<br />*[http://en.wikipedia.org/wiki/John_Nicholson_(East_India_Company_officer) John Nicholson] Wikipedia<br />*[http://www.azkhan.de/MyWebalbums_PhotosPakistan_NicholsonObelisk.htm Nicholson's obelisk] www.azkhan.de*Listen to [http://www.bacsa.org.uk/?page_id=2227 ''Dark Hero: Nicholson of Delhi''], [[BACSA]] podcast from a presentation 11 February 2019 by Stuart Flinders, BBC journalist, broadcaster and author of ''Cult of a Dark Hero: Nicholson of Delhi'' (2018).