Bibliographical references  : essential elements 

 - (s.l.) :  The Organization,  1958 
 - 7 p 
 - ISO recommendation  ; R77 .
 - ISO recommendation  ; R77 .
<br/><br/><label>LCCN: </label>25998 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Citas bibliográficas.