(Adaptada de la Norma COPANT) /  
IRAM 
 - 1a. ed. 
 - Buenos Aires :  IRAM,  1972 
 - 1 p. :    30 cm 
<br/><br/><label>LC Class. No.: </label> / I 58 
<br/><br/><label>Universal Decimal Class. No.: </label>675