George Johnston Allman. (1889) Greek Geometry from Thales to Euclid, 2005‑a eldono, Hodges, Figgis, & Co, p. 26. ISBN 1-4326-0662-X. “The discovery of the law of three squares, commonly called the "theorem of Pythagoras" is attributed to him by – amongst others – Vitruvius, Diogenes Laertius, Proclus, and Plutarch ...”.
