APA (7th ed.) Citation

Library of Congress. (1927). Classification: Class Z, Bibliography and library science. U.S. GPO.

Chicago Style (17th ed.) Citation

Library of Congress. Classification: Class Z, Bibliography and Library Science. Washington: U.S. GPO, 1927.

MLA (9th ed.) Citation

Library of Congress. Classification: Class Z, Bibliography and Library Science. U.S. GPO, 1927.

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