APA

U.S. Customs and Border Protection, .International mail imports: customs inspections of mailed parcels. Washington, D.C: U.S. Customs & Border Protection, U.S. Dept. of Homeland Security.

Chicago

U.S. Customs and Border Protection, .International mail imports: customs inspections of mailed parcels. Washington, D.C: U.S. Customs & Border Protection, U.S. Dept. of Homeland Security.

Harvard

U.S. Customs and Border Protection, .International mail imports: customs inspections of mailed parcels. Washington, D.C: U.S. Customs & Border Protection, U.S. Dept. of Homeland Security.

MLA

U.S. Customs and Border Protection, .Washington, D.C: U.S. Customs & Border Protection, U.S. Dept. of Homeland Security. .