APA (7th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section & United States. Army Map Service. (1942). Belgium & N. E. France 1: 100,000. War Office.

Chicago Style (17th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and United States. Army Map Service. Belgium & N. E. France 1: 100,000. [London]: War Office, 1942.

MLA (8th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and United States. Army Map Service. Belgium & N. E. France 1: 100,000. War Office, 1942.