Descartes, Rene,  1596-1650. <br/><br/>
Rules for the direction of the mind / 
translated with an introduction by Laurence J. Lafleur. 
 - Indianapolis :  Bobbs-Merrill,  1961. 
 - 92 p. ;  21 cm. 
 - Library of liberal arts ;  no. 129 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reasoning.<br/>Logic, Symbolic and mathematical.