Lua APA (7ú heag.)

Não informado. (1931). Cotton situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.

Lua i Stíl Chicago (17ú heag.)

Não informado. Cotton Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1931.

Lua MLA (8ú heag.)

Não informado. Cotton Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1931.

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