Locke, John; Berkeley, George; Hume, David <br/><br/>
A letter Concernig Toleration. Concerning civil goernment, second essay an essay convetning human undestanding: The Principles of Human Knoeledge; An Enquiry concerning Human Understanding 

 - Chicago, Estados Unidos de América :  Encyclopedia Britannica, Inc.,   1952 
 - 509 p.