Hughes, G E <br/><br/>
Elements of formal logic 

 - Bombay:   B. I. Publications,   1965 
 - xii, 392p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Axiomatic systems
<br/><br/><label>Universal Decimal Class. No.: </label>168.51  / K5-;1