Library of Congress. (2009). Subject headings. Washington, DC: Library of Congress.
استشهاد بنمط شيكاغوLibrary of Congress. Subject Headings. Washington, DC: Library of Congress, 2009.
MLA استشهادLibrary of Congress. Subject Headings. Washington, DC: Library of Congress, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.