United States. Library of Congress. Policy and Standards Division. (2009). Library of Congress subject headings: Free-floating subdivisions, genre/form headings, children's subject headings. Library of Congress, Cataloging Distribution Service.
Citazione stile Chigago Style (17a edizione)United States. Library of Congress. Policy and Standards Division. Library of Congress Subject Headings: Free-floating Subdivisions, Genre/form Headings, Children's Subject Headings. Washington, D.C: Library of Congress, Cataloging Distribution Service, 2009.
Citatione MLA (9a ed.)United States. Library of Congress. Policy and Standards Division. Library of Congress Subject Headings: Free-floating Subdivisions, Genre/form Headings, Children's Subject Headings. Library of Congress, Cataloging Distribution Service, 2009.