APA (7th ed.) Citation

Library of Congress. (1937). Information for readers in main reading room, 1937 [Library of Congress]. [s.n.].

Chicago Style (17th ed.) Citation

Library of Congress. Information for Readers in Main Reading Room, 1937 [Library of Congress]. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

Library of Congress. Information for Readers in Main Reading Room, 1937 [Library of Congress]. [s.n.], 1937.