Dyfyniad APA

(2006). Library of congress Subject Headings. Washington, D.C: Library of Congress.

Dyfyniad Arddull Chicago

Library of Congress Subject Headings. Washington, D.C: Library of Congress, 2006.

Dyfyniad MLA

Library of Congress Subject Headings. Washington, D.C: Library of Congress, 2006.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.