APA

Library of Congress, . (1961). Classification : auxiliary sciences of history. New York: Library of Congress.

Chicago

Library of Congress, . 1961. Classification : auxiliary sciences of history. New York: Library of Congress.

Harvard

Library of Congress, . (1961). Classification : auxiliary sciences of history. New York: Library of Congress.

MLA

Library of Congress, . Classification : auxiliary sciences of history. New York: Library of Congress. 1961.