Copi, Irving M..
Introduction to logic /
Irving M. Copi, Carl Cohen 
. - 8th edition 
. - New York : Macmillan Publishing Company, London : Collier Macmillan Publishers,  1990 
. - xiv, 569 p.  tab., schem.  24 cm. 
<br/><label>  ISBN: </label>0-02-325035-6