APA (7th ed.) Citation

(2014). History of the presidential limousines (Revised, September 2014.). U.S. Department of Homeland Security, United States Secret Service.

Chicago Style (17th ed.) Citation

History of the Presidential Limousines. Revised, September 2014. [Washington, D.C.]: U.S. Department of Homeland Security, United States Secret Service, 2014.

MLA (9th ed.) Citation

History of the Presidential Limousines. Revised, September 2014. U.S. Department of Homeland Security, United States Secret Service, 2014.