Não informado. (2021). LC Classification, Additions and Changes. Library of Congress.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. LC Classification, Additions and Changes. Washington: Library of Congress, 2021.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. LC Classification, Additions and Changes. Library of Congress, 2021.
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