Khác biệt giữa bản sửa đổi của “John Harrison”
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*[http://www.bbc.co.uk/ahistoryoftheworld/objects/arSAQ-UETSOyftkNWZTpVQ Harrison's precision pendulum-clock No. 2, 1727, on the BBC's "A History of the World" website]
*[http://secretlivesofobjects.blogspot.com/2010/04/more-than-just-pretty-tick-tock-clock.html Leeds Museums and Galleries "Secret Life of Objects" blog, John Harrison's precision pendulum-clock No. 2]
*[http://www.booknotes.org/Watch/116077-1/Dava+Sobel.aspx ''Booknotes'' interview with Dava Sobel on ''Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time'', ngày 17 tháng 1 năm 1999.] {{Webarchive|url=https://web.archive.org/web/20120509202143/http://www.booknotes.org/Watch/116077-1/Dava+Sobel.aspx |date=2012-05-09 }}
*[http://cudl.lib.cam.ac.uk/view/MS-H-17809 Account of John Harrison and his chronometer] at [[Cambridge Digital Library]]
*[https://www.theatlantic.com/technology/archive/2016/01/pendulum-clock-john-harrison/424614/ Building an Impossible Clock] Shayla Love, Jan 19, 2016, ''The Atlantic''
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