Necessary truth /
edited by R.C. Sleigh, Jr. 
. - Englewood Cliffs : Prentice-Hall, Inc.,  1972 
. - vi, 202 p.  21 cm. 
 - (Central issues in philosophy series )
<br/>К.: Бібліогр. : c. 200-202 
<br/><label>  ISBN: </label>0-13-610758-3