APA

United States, . (1970). Puerto Rican-Virgin Islands trade study: a regulatory staff analysis. Washington: For Sale by the Supt. of Docs., U.S. Govt. Print. Off.

Chicago

United States, . 1970. Puerto Rican-Virgin Islands trade study: a regulatory staff analysis. Washington: For Sale by the Supt. of Docs., U.S. Govt. Print. Off.

Harvard

United States, . (1970). Puerto Rican-Virgin Islands trade study: a regulatory staff analysis. Washington: For Sale by the Supt. of Docs., U.S. Govt. Print. Off.

MLA

United States, . Puerto Rican-Virgin Islands trade study: a regulatory staff analysis. Washington: For Sale by the Supt. of Docs., U.S. Govt. Print. Off. 1970.