Etexts:
- HTML (single page) at Bartleby.com
- Multi-Format (HTML, EPUB, Kindle, Text) at Project Gutenberg
- French Multi-Format (HTML, EPUB, Kindle, Text) at Project Gutenberg (Translated by François Pierre Guillaume Guizot)
- Spanish PDF (link page) at Biblioteca Virtual Universal (Translated by Ramón García González)
All links verified on or after May 7, 2019