APA (7th ed.) Citation

Library of Congress. (1939). Information for readers in reading rooms, 1939 [Library of Congress]. [s.n.].

Chicago Style (17th ed.) Citation

Library of Congress. Information for Readers in Reading Rooms, 1939 [Library of Congress]. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

Library of Congress. Information for Readers in Reading Rooms, 1939 [Library of Congress]. [s.n.], 1939.