APA
Library of Congress, . (1969). Annual report of the librarian of congress (1968). Washington D. C: .
Chicago
Library of Congress, . 1969. Annual report of the librarian of congress (1968). Washington D. C: .
Harvard
Library of Congress, . (1969). Annual report of the librarian of congress (1968). Washington D. C: .
MLA
Library of Congress, . Annual report of the librarian of congress (1968). Washington D. C: . 1969.
