APA (7th ed.) Citation

U.S. Customs and Border Protection. (2007). Welcome to the United States: A guide for international visitors. U.S. Customs and Border Protection.

Chicago Style (17th ed.) Citation

U.S. Customs and Border Protection. Welcome to the United States: A Guide for International Visitors. Washington, D.C.: U.S. Customs and Border Protection, 2007.

MLA (9th ed.) Citation

U.S. Customs and Border Protection. Welcome to the United States: A Guide for International Visitors. U.S. Customs and Border Protection, 2007.