APA (7th ed.) Citation

United States. Army Map Service. (1950). Central Philippines 1: 50,000 (Ed. 2-AMS, ed. no. 002.). Army Map Service.

Chicago Style (17th ed.) Citation

United States. Army Map Service. Central Philippines 1: 50,000. Ed. 2-AMS, ed. no. 002. Washington D.C.: Army Map Service, 1950.

MLA (8th ed.) Citation

United States. Army Map Service. Central Philippines 1: 50,000. Ed. 2-AMS, ed. no. 002. Army Map Service, 1950.