Encyclopedia
- Encyclopaedia, or Reasoned Dictionary of the Sciences, Arts, and Trades, edited by Denis Diderot and Jean le Rond d'Alembert, to which Voltaire contributed.
- http://quod.lib.umich.edu/cgi/b/bib/bibperm?q1=did2222.0000.004

Toleration and Other Essays by Voltaire
- Translated, with an introduction, by Joseph McCabe, 1912.
- http://oll.libertyfund.org/ToC/0029.php

Voltaire's Philosophical Dictionary
- 1924 translation by H. I. Woolf.
- http://history.hanover.edu/texts/voltaire/volindex.html

Poetry Archive: Voltaire
- Includes translations of about 10 poems.
- http://www.poetry-archive.com/v/voltaire.html

Letters on the English
- Text at Bartleby.com.
- http://www.bartleby.com/34/2/

Letters On The English Or Lettres Philosophiques
- E-text at Modern History Sourcebook with a brief introduction.
- http://www.fordham.edu/halsall/mod/1778voltaire-lettres.html

Letters on England
- Complete chapter-indexed hypertext of Voltaire's text.
- http://literatureproject.com/book/voltaire/letters-voltaire/index.htm

A Treatise on Toleration
- Voltaire's 1763 work, translated by Richard Hooker.
- http://www.wsu.edu:8080/~wldciv/world_civ_reader/world_civ_reader_2/voltaire.html