APA (7th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section & Great Britain. Ordnance Survey. (1937). France and Belgium 1: 50,000. War Office.

Chicago Style (17th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and Great Britain. Ordnance Survey. France and Belgium 1: 50,000. [London]: War Office, 1937.

MLA (8th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and Great Britain. Ordnance Survey. France and Belgium 1: 50,000. War Office, 1937.