APA (7th ed.) Citation

(2000). Balloons and airships. Library of Congress, Science, Technology & Business Division, Science Reference Services.

Chicago Style (17th ed.) Citation

Balloons and Airships. [Washington, D.C.]: Library of Congress, Science, Technology & Business Division, Science Reference Services, 2000.

MLA (9th ed.) Citation

Balloons and Airships. Library of Congress, Science, Technology & Business Division, Science Reference Services, 2000.