United States. Library of Congress. (1994). Library of Congress classification. H. Social sciences. Library of Congress.
Lua i Stíl Chicago (17ú heag.)United States. Library of Congress. Library of Congress Classification. H. Social Sciences. Washington, D.C: Library of Congress, 1994.
Lua MLA (9ú heag.)United States. Library of Congress. Library of Congress Classification. H. Social Sciences. Library of Congress, 1994.
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