APA
LIBRARY OF CONGRESS, LIBRARY OF CONGRESS, . (1971). Annual report,1970. Washington: Library of Congress.
Chicago
LIBRARY OF CONGRESS, LIBRARY OF CONGRESS, . 1971. Annual report,1970. Washington: Library of Congress.
Harvard
LIBRARY OF CONGRESS, LIBRARY OF CONGRESS, . (1971). Annual report,1970. Washington: Library of Congress.
MLA
LIBRARY OF CONGRESS, LIBRARY OF CONGRESS, . Annual report,1970. Washington: Library of Congress. 1971.
