APA (7th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. (1939). Central Europe and the Mediterranean as of September 1, 1939. [publisher not identified].

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. Central Europe and the Mediterranean as of September 1, 1939. Washington: [publisher not identified], 1939.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Cartographic Division. Central Europe and the Mediterranean as of September 1, 1939. [publisher not identified], 1939.

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