Biggs, Norman (2013). "Thomas Harriot". BSHM Bulletin: Journal of the British Society for the History of Mathematics. 28 (2): 66—74. doi:10.1080/17498430.2013.721331. S2CID53586313.
Biggs, Norman (2013). "Thomas Harriot". BSHM Bulletin: Journal of the British Society for the History of Mathematics. 28 (2): 66—74. doi:10.1080/17498430.2013.721331. S2CID53586313.