Não informado. (2021). LC Classification, Additions and Changes. Library of Congress.
Chicago-referens (17:e uppl.)Não informado. LC Classification, Additions and Changes. Washington: Library of Congress, 2021.
MLA-referens (8:e uppl.)Não informado. LC Classification, Additions and Changes. Library of Congress, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.