Library of Congress subject headings: Free-floating subdivisions, genre/form headings, children's subject headings. Washington, D.C: Library of Congress, Cataloging Distribution Service.

Library of Congress subject headings : Free-floating subdivisions, genre/form headings, children's subject headings / prepared by the Policy and Standards Division, Library Services . — Washington, D.C : Library of Congress, Cataloging Distribution Service. — v

Library of Congress Subject Headings: Free-floating Subdivisions, Genre/form Headings, Children's Subject Headings.Washington, D.C: Library of Congress, Cataloging Distribution Service.