References on the web

• This version of Euclid’s Elements is located at https://www.euclids-elements.org/. It has been updated from Dr. David E. Joyce’s original site at Clark University, which resides at http://aleph0.clarku.edu/~djoyce/java/elements/toc.html.

• The site http://www.euclides.org/ in Catalan has links for Euclid and the Elements. It includes a translation into Catalan of the statments of the definitions, postulates, and axioms of the Elements.

• The text of Heath's translation of Euclid’s Elements on-line at the Perseus Project, http://www.perseus.tufts.edu/, at Tuft's University. Not just Heath's translation, but his commentary as well as the Greek text is available at the Perseus Project.

• Green Lion Press has published Heath’s version of Euclid’s Elements in one volume.

• In 1847 Oliver Byrne designed a wonderful version of the first six books of the Elements with an imaginative use of color to illustrate geometry. Nicholas Rougeux has produced a beautiful interactive web recreation at https://www.c82.net/euclid/, with clickable shapes and faithful tracings of the original diagrams. An earlier digitization by Bill Casselman at the University of British Columbia is preserved on the Wayback Machine.

• Richard Fitzpatrick’s Euclid’s Elements of Geometry, 2007–2008, at https://farside.ph.utexas.edu/Books/Euclid/Elements.pdf includes Heiberg’s Greek text alongside Fitzpatrick’s translation. It’s in a downloadable and printable PDF format.

• J.T. Poole’s Euclid The Elements, Books I–IV, 2002, at http://math.furman.edu/~jpoole/euclidselements/euclid.htm. The steps of each proposition are individually illustrated.