Swift: A Modest Proposal
http://darkwing.uoregon.edu/~rbear/modest.html
Bernard Mandeville: The Grumbling Hive
http://oll.libertyfund.org/ToC/0014-01.php
This link is to a much clearer text than the Rutgers link I had up earlier. The relevant matter is linked to as "The Preface and the Poem", about half way down this page. The other material, especially the Introduction, may also be helpful.
Adam Smith: The Wealth of Nations
Lualdi contains the first twelve paragraphs of Book Four, Chapter II: `Of Restraints upon the Importation from Foreign Countries of such Goods as can be produced at Home'. A clearly laid out online text of the whole book is available at
http://www.adamsmith.org/smith/won-intro.htm
Voltaire: Candide
http://www.literature.org/authors/voltaire/candide/
Rousseau: Confessions and Emile
Norton has short extracts from each of the first six books. A full translation may be found at:
http://www.swan.ac.uk/poli/texts/rousseau/confcon.htm
Norton has extracts from Book Five of Emile. The whole work may be found at:
http://www.ilt.columbia.edu/pedagogies/rousseau/Contents2.html