APA (7th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section & United States. Army Map Service. (1942). Islands of Porto Santo and Desertas. Published by War Office.

Chicago Style (17th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and United States. Army Map Service. Islands of Porto Santo and Desertas. [London]: Published by War Office, 1942.

MLA (9th ed.) Citation

Great Britain. War Office. General Staff. Geographical Section and United States. Army Map Service. Islands of Porto Santo and Desertas. Published by War Office, 1942.