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- Robert Recorde (1510 - 1558) - Biography (ac.uk)
- RECORDE, ROBERT (c. 1512-1558), mathematician and physician (biography.wales)
- Robert Recorde | Welsh Mathematician & Inventor of the Equal Sign (britannica.com)
- The Equality of Robert Recorde - mathMastery Blog (wordpress.com)
- The equals of Robert Recorde - QEDcat (qedcat.com)
- Robert Recorde's mathematical inventions - BBC (co.uk)
- Robert Recorde Facts for Kids (kiddle.co)