Library of Congress. (1996). Subject headings. Washington, D.C: Library of Congress, Cataloging Distribution ServiceLibrary of Congress.
Dyfyniad Arddull ChicagoLibrary of Congress. Subject Headings. Washington, D.C: Library of Congress, Cataloging Distribution ServiceLibrary of Congress, 1996.
Dyfyniad MLALibrary of Congress. Subject Headings. Washington, D.C: Library of Congress, Cataloging Distribution ServiceLibrary of Congress, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.