APA (7th ed.) Citation

Library of Congress. (1946). Classification ([Preliminary draft].). [Library of Congress].

Chicago Style (17th ed.) Citation

Library of Congress. Classification. [Preliminary draft]. Washington: [Library of Congress], 1946.

MLA (8th ed.) Citation

Library of Congress. Classification. [Preliminary draft]. [Library of Congress], 1946.

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