[[WorldCat]] is a global cooperative [[union catalog]] which itemises the collections of 72,000 libraries in 170 countries and territories. What follows are three authority control records: the GND is the [[Integrated Authority File]] (in German), the second is the [[Library of Congress Control Number]] (LCCN) and the last is the [[Virtual International Authority File]] (VIAF).
==Supported files==
The supported authority files on the English Wikipedia are:
# [[Integrated Authority File]] (''{{lang|de|Gemeinsame Normdatei}}'' or GND)
# [[Library of Congress Control Number]] (LCCN)
# [[Virtual International Authority File]] (VIAF)
# [[LIBRIS]] by the [[National Library of Sweden]] (SELIBR)
# [[ORCID|Open Researcher and Contributor ID]] (ORCID)
# Outdated: [[Name Authority File]] (''{{lang|de|Personennamendatei}}'' or PND), now part of GND
# Outdated: [[Corporate Bodies Authority File]] (''{{lang|de|Gemeinsame Körperschaftsdatei}}'' or GKD), now part of GND
# Outdated: [[Subject Headings Authority File]] (''{{lang|de|Schlagwortnormdatei}}'' or SWD), now part of GND
