(1998). Library of Congress subject headings. Washington, D.C: Library of Congress, Cataloging Distribution Service.
Παραπομπή Chicago StyleLibrary of Congress Subject Headings. Washington, D.C: Library of Congress, Cataloging Distribution Service, 1998.
Παραπομπή MLALibrary of Congress Subject Headings. Washington, D.C: Library of Congress, Cataloging Distribution Service, 1998.
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