Etchemendy, John. <br/><br/>
The concept of logical consequence /  
John Etchemendy. 
 - Harvard :   University Press,   1990. 
 - 174 p. ;   24 cm. 
<br/><br/><label>ISBN: </label>0-674-15642-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lógica matemática
<br/><br/><label>Universal Decimal Class. No.: </label>16 164