Ayer, A. J.  1910- <br/><br/>
The foundations of empirical knowledge / 
by Alfred J. Ayer 
 - London :  MacMillan,  1969 
 - x, 276 p. ;  18 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Knowledge, Theory of<br/>Perception