United States Tariff Commission. (1938). Supplement to third edition of printed pamphlet entitled Changes in import duties since the passage of the tariff act of 1930. [s.n.].
Chicago Style (17th ed.) CitationUnited States Tariff Commission. Supplement to Third Edition of Printed Pamphlet Entitled Changes in Import Duties Since the Passage of the Tariff Act of 1930. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States Tariff Commission. Supplement to Third Edition of Printed Pamphlet Entitled Changes in Import Duties Since the Passage of the Tariff Act of 1930. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.