APA (7th ed.) Citation

U.S. Customs Service. (1989). Tariff classification of prospective imports. Dept. of the Treasury, U.S. Customs Service.

Chicago Style (17th ed.) Citation

U.S. Customs Service. Tariff Classification of Prospective Imports. [Washington, D.C.?]: Dept. of the Treasury, U.S. Customs Service, 1989.

MLA (9th ed.) Citation

U.S. Customs Service. Tariff Classification of Prospective Imports. Dept. of the Treasury, U.S. Customs Service, 1989.