Referências úteis

BAD
URL: http://www.apbad.pt

CDU - Classificação Decimal Universal
URL: http://www.udcc.org/
URL: http://www.compusmart.ab.ca/plambeck/udc/

Citações de recursos digitais
URL: http://www.apastyle.org/elecref.html
URL: http://www.digital-librarian.com/citations.html

IFLA
URL: http://www.ifla.org

ISBDs (geral)
URL: http://www.ifla.org/VI/3/nd1/isbdlist.htm

Metadados
URL: http://dublincore.org

PORBASE
URL: http://www.porbase.org

UNIMARC
URL: http://www.ifla.org/VI/3/p1996-1/sec-uni.htm

USMARC/MARC21
URL: http://lcweb.loc.gov/marc/
URL: http://oclc.org/oclc/bib/about.htm

Z39.50
URL: http://www.ifla.org/IV/ifla63/63lynl.pdf
URL: http://www.loc.gov/z3950/gateway.html
URL: http://www.db.dk/dbi/internet/bdi_z39.htm