APA

Bidwell P. W., . (1933). Tariff policy of the United States. New York: N.N.

Chicago

Bidwell Percy W, . 1933. Tariff policy of the United States. New York: N.N.

Harvard

Bidwell P. W., . (1933). Tariff policy of the United States. New York: N.N.

MLA

Bidwell Percy W, . Tariff policy of the United States. New York: N.N. 1933.