APA (7th ed.) Citation

United States. Army Map Service. (1941). Greenland. The Service.

Chicago Style (17th ed.) Citation

United States. Army Map Service. Greenland. Washington, D.C.: The Service, 1941.

MLA (8th ed.) Citation

United States. Army Map Service. Greenland. The Service, 1941.

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