USMARC Specifications for Record Structure, Character Sets, Tapes / 
Prepared by Network Development and MARC Standards Office 
 - Washington :  Library of Congress,   1990 
 - 45 tr. ;   28 cm. 
<br/><br/><label>ISBN: </label>8444405973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MARC formats<br/>Định dạng Marc
<br/><br/><label>Dewey Class. No.: </label>025.316  / U86