Library of Congress & Library of Congress. Catalog Maintenance Division. Library of Congress catalog: Books: subjects; a cumulative list of works represented by Library of Congress printed cards. Library of Congress.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Library of Congress và Library of Congress. Catalog Maintenance Division. Library of Congress Catalog: Books: Subjects; a Cumulative List of Works Represented by Library of Congress Printed Cards. Washington: Library of Congress.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Library of Congress và Library of Congress. Catalog Maintenance Division. Library of Congress Catalog: Books: Subjects; a Cumulative List of Works Represented by Library of Congress Printed Cards. Library of Congress.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.