APA (7th ed.) Citation

United States Tariff Commission. (1939). Supplement to Changes in import duties since the passage of the tariff act of 1930 (issued Jan. 1939). [s.n.].

Chicago Style (17th ed.) Citation

United States Tariff Commission. Supplement to Changes in Import Duties Since the Passage of the Tariff Act of 1930 (issued Jan. 1939). [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States Tariff Commission. Supplement to Changes in Import Duties Since the Passage of the Tariff Act of 1930 (issued Jan. 1939). [s.n.], 1939.