APA (7th ed.) Citation

United States. Office of Strategic Services. Research and Analysis Branch. (1945). El Salvador, Sonsonate and environs (Provisional ed.). Lithographed in Reproduction Branch, OSS.

Chicago Style (17th ed.) Citation

United States. Office of Strategic Services. Research and Analysis Branch. El Salvador, Sonsonate and Environs. Provisional ed. [United States?]: Lithographed in Reproduction Branch, OSS, 1945.

MLA (8th ed.) Citation

United States. Office of Strategic Services. Research and Analysis Branch. El Salvador, Sonsonate and Environs. Provisional ed. Lithographed in Reproduction Branch, OSS, 1945.