
The Thirteen Books of Euclid's Elements (1908)
Preface p. viii
A History of Greek Mathematics (1921) Vol. 1. From Thales to Euclid
The Thirteen Books of Euclid's Elements (1908)
Source: The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 1 (1788), Ch. IV. On the Origin of Geometry, and its Inventors.
As quoted by Sir Thomas Little Heath, The Thirteen Books of Euclid's Elements (1908) Vol.1 https://books.google.com/books?id=UhgPAAAAIAAJ Introduction and Books I, II p.1, citing Proclus ed. Friedlein, p. 68, 6-20.
Source: "Presidential Address British Association for the Advancement of Science," 1890, p. 467 : On the perfection of math. productions