APA (7th ed.) Citation

National Research Council (U.S.). Library. (1941). International scientific congresses held since 1939, or announced for 1941 or later. National research council.

Chicago Style (17th ed.) Citation

National Research Council (U.S.). Library. International Scientific Congresses Held Since 1939, or Announced for 1941 or Later. Washington, D.C.: National research council, 1941.

MLA (9th ed.) Citation

National Research Council (U.S.). Library. International Scientific Congresses Held Since 1939, or Announced for 1941 or Later. National research council, 1941.