Não informado. (2021). LC Classification, Additions and Changes. Library of Congress.
Chicago-Zitierstil (17. Ausg.)Não informado. LC Classification, Additions and Changes. Washington: Library of Congress, 2021.
MLA-Zitierstil (8. Ausg.)Não informado. LC Classification, Additions and Changes. Library of Congress, 2021.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.