APA (7th ed.) Citation

Library of Congress. (1977). Librarians of Congress, 1802-1974. Library of Congress.

Chicago Style (17th ed.) Citation

Library of Congress. Librarians of Congress, 1802-1974. Washington: Library of Congress, 1977.

MLA (8th ed.) Citation

Library of Congress. Librarians of Congress, 1802-1974. Library of Congress, 1977.

Warning: These citations may not always be 100% accurate.