8Library Of Congress. Network Development and MARC Standards Office. Marc 21 concise format for bibliographic data. httv://lcweb,.loc. gov/marc/bibliogravhic.
9International Federation of Library Associations and Insitutions[el a1.]UNIMARC manual:bibliographic format.http:／／www.ifla.org／VI／3／p1996—1／sec—uni.htm.
